Starlight Drive-In seems like an ideal spot for traders travelling down the railway lines to meet up with traders from Boston, so they don't have to run the gauntlet of Lexington and Cambridge. I seem to spend half of every play-through building here, so...

I built this ridiculous thing for myself, and decided to save it. It was supposed to be a completely-vanilla blank-canvas but, somehow, I messed that up. It is now a mostly-vanilla blank-canvas. You will need Reginald's PreFab ShackFest, on top of the DLCs. That's probably fine, though, because Reginald's PreFab ShackFest is a fantastic mod. 

Some of the screenshots show showers and toilets from Universal Working Bathroom Fixtures. I took them all out before I saved the blueprint, so it's not a requirement.

Otherwise, it really is a blank canvas...it has no beds, very little furniture, no stores, and no settlement beacon. It does, however, have:

-North and South gates, with no other entrances
-Ample defence around both gates
-Many workbenches, including a power-armour station
-Partially planted rooftop gardens
-Plenty of water, with extra pumps by the gates
-Three medium generators, with all the wiring in place
-Some doors!
-A big industrial building in the Southwest corner, for all your big machines
-Guardrails around most of the high bits
-A hostile Colonel Gutsy turned up while I was on a rooftop taking screenshots, but I lost track of him and honestly, I don't know, he may still be in there somewhere

There is quite a lot there, and it does cost me some FPS. Your mileage may vary, of course, but you can always blow it up again if it's too much
Also, it's in slot #1 by default...sorry about that

Just clear the molerat infestation, do a full vanilla scrap, and you're good to go

If you do choose to use it, I would genuinely love to see some screenshots

Cheers