NEW VERSION REQUIRES NEW MODS - DON'T FORGET TO CHECK THE LIST BELOW
The 2.7 update includes -

• Pre-wired power working with the latest version of transfer settlements 1.43
• Removal of all Snap and Build objects. No more mods needed that can't be downloaded.
• Slight alteration of the layout of floors 4 and 5. The executive boardroom on floor 5 no longer has horrible clipping issues.
• Research department on floor 4 is finished. Layout has been tweaked, changing rooms added, and everything furnished and fully decorated.
• Cinema has been added to floor 4. Furnishings only, no decoration. May be altered in the future if I can get some tiered seating to work.
• The luxury residences on floor 1 are finished and decorated. I've set them up with Danse, Shaun and Cait in mind.
• Overseer's bedroom and bathroom furnished and decorated.
• Pixel art rainbow in the nightclub is wired up and working. No more wireless lightboxes needed.
• Large water plant now wired up and working.
• Various small tweaks to the decoration throughout the vault.
  

A WIP build of my modded Vault 88. The structure is 95% done. Most rooms have the basic furniture laid out. Some have simple decoration and some are fully decorated. I'm uploading it before it's completed because it's getting big. So big that it takes 45 mins for me to export it  to a blueprint, and it crashed my  game 3 times in a row when I tried. I might not be able to export anything bigger without my computer bursting into flames. So yeah, it might get updated as I decorate it more, it might not. Either way, the update attempts won't be frequent. So take it as you find it, and do with it as you will.

It's built to be easy to  navigate, with the vast majority of the rooms being built around a central atrium. Only a small amount of the separate sectors and connecting caves have been used. So there's plenty of room to expand out if you wanted to.
 
Because it's  a big, detailed, build you'll probably notice some screen tearing in parts of the vault. I don't know how, or even if it can be fixed. Expect frame rate drops, especially on older machines like mine. I'm running a single GTX 970, high and ultra settings. I get 25-35 fps in the  main part of the vault, increasing to 60 in the caves.

Version 2.7 was exported with transfer settlemets 1.43, so the power comes hooked up. However, version 1.0 will need rewiring and a little work to get it looking like it does in the pictures and video. This is a transfer settlements issue and there's nothing I can do about it. I've tried to make the rewiring process as simple as possible, but it will involve console commands, no clipping and a little cheaty witchcraft. I recommend you use place everywhere to make it as painfree as possible. In fact, I recommend that mod anyway. It's a settlement build essential as far as I'm concerned.

Here's a video walkthrough of how to rewire the place in v1.0




Mods used for the basic structure

• Vault-tec DLC (obviously)
• If you want to alter things you need a build limit increaser, I use Increaded Build Limit Enhancer 4k
• Power Conduits radius increaser, I used Power Conduits and Pylons x3
• Snappy HouseKit including snappy Decokit addon used  for the non-vault walls, floors, stairs ect
• Modular Vault 88 Rooms including more vault rooms addon and railings addons, (main file and both optional files).
• More Vault Rooms
• Vault 88 Room Corners Plus including addon for more vault rooms
• Vault-Tec SimuSun Lighting - without it your vault will  be dark and dismal
• Place Everywhere - if you want to alter things in the vault, rewire or move things around
• The Cabin in the  Woods - used in the sauna and for fireplaces (new for 2.7)
• HUD Framework - required for transfer settlements to work
• F4SE - required for transfer settlements to work
• Transfer Settlements - version 1.43 recommended, read the page carefully to install and use correctly
  
  

Important furniture & decoration mods

• All official DLC (except high res texture pack)
• B.Y.O.P - swimming pools and showers
• Clean Pre-War Assets Expanded - clean furniture
• Colored Workshop Lights - lights used in the bar to make the caves and water look better
• Craftable Vault Elevator - working vault style elevator
• CWSS Redux v2 - working showers and bathroom furniture, used  extensively
• Dino's Decorations - decorative clutter mod
• Do It Yourshelf - shelving and clutter, used extensively
• Homemaker - furntiure and decorations, used extensively
• Just some Curtains and Rods - used in the clinic
• Manufacturing Extended - essential if you want the factory to work
• Modular Kitchen - clean kitchens and worktops, used extentively
• More snapable vendor counter pieces - used in the shops
• NWM Playing House - used for the static ironing board in the laundry, may use more in future
• OCDecorator - used extensively for decoration
• Rennovated Furniture - clean chairs, beds and sofas, used extensively
• School Desk - assignable school and teacher desks in several colours
• Snap Beds - nicer beds, child beds and working double beds
• This is MY Bed - bed that settlers don't sleep on. Used for overseer's bedroom, jail and hospital beds
• Vault 88 Extras - extra vault signs and one way windows
• Northland Digger Resources - used for the science center (new for 2.7)
• Creative Clutter - great decorative items (new for 2.7)
• Living Interior - used for various bits of decoration (new for 2.7)
• More Vault  Signs - does what you'd expect it to (new for 2.7)
• Settlement Objects Expansion Pack - water you might want to swim in and lots of great decoration (new for 2.7)
• Unlocked Settlement Objects - core mod with loads of great decoration, but it completely reorganises your build categories, making stuff a pain to find (new for 2.7)
• USO Automatron - addon for Unlocked Settlent Objects, mainly used for scrap robot parts (new for 2.7)
• Vault 88 extras including More Vault Rooms compatibility patch (new for 2.7)
  
  
  
  

Also used and/or recommended, but not essential

• Auto Doors and Auto Doors DLC patch for automated door closing and keycard locked areas.
• Busy Settlers and Rugs for settler animation workstations and rugs. Unused in v1.0, but I have plans to use in the future
• Dog Bed for Dogmeat - nice bed for dogmeat, used in the overseer's lounge
• Functional Displays - only used a couple of times so far, but will be using in shops in future versions
• Gruffydd's Signs and Posters - used twice, for eye exam poster and "prisoners beyond this line will be shot" decal
• Invisible Furniture - used once in the gym to make people do pushups, may use more in future builds
• Locksmith - lock your doors and containers
• Stocked Vendor Counter Display Cases - (new for 2.7)