*** PLEASE NOTE ***
User polbashkisneslo has, with full permission, uploaded an updated version of this mod at http://fallout3.nexusmods.com/mods/19443. I'll leave this mod up for those interested, but suggest that polbashkisneslo's version be used in preference.

Thanks polbashkisneslo!
*** END NOTE ***

Now updated to 0.4.2, new features are;
Flamer and Missile Launcher can now be mounted.
The Missile launcher has a laser sight, this will cut off when moving at more than a slow drift.
Minigun and Flamer now have clips with on-screen clip & ammo counters.
A reload button has been implemented for Minigun and Flamer.
Installing batteries has been simplified.
A User Manual and Quickstart Guide can be found in the HoverChair's storage.

I've included in this version a Hoverchair 0.4.2 - MK2.esp which uses Falcon8204's brand new HoverChair model. This model includes a roll-cage which makes the chair much easier to use in 1st person view. It isn't fully textured yet, and may be altered in future, but opinions and feedback on it are most welcome.

Requires:
Fallout 3 Version 1.5 or higher
Fallout Script Extender (FOSE) version 1.1 b9 or higher (available from http://fose.silverlock.org)
Framerate of 30 FPS or higher

This version isn't savegame compatible with earlier versions; please uninstall any other version and clean your savegame before installing 0.4 (see http://www.bethsoft.com/bgsforums/index.php?s=&showtopic=960580&view=findpost&p=13877387)

Discussion thread on Bethesda forums: http://www.bethsoft.com/bgsforums/index.php?showtopic=971904

This is a further improved release of a work-in-progress drivable vehicle mod. The HoverChair can be found outside the Super Duper Mart near Megaton.

The HoverChair runs on fission batteries, which can be found scattered sparsely throughout the Washington DC wastelands, and can be retrieved from the wrecks of some robots by experienced travellers. This abandoned test vehicle has one battery in its on-board storage, along with a useful remote control. If you're finding it hard to locate enough fission batteries, Echonite's Echo_BatteryCharger (http://www.fallout3nexus.com/downloads/file.php?id=1696) can produce new fission batteries from various weapon energy cells, and Highsight's Solar Charger (http://www.fallout3nexus.com/downloads/file.php?id=2021) can produce new weapon energy cells from sunlight.

Activate the HoverChair while crouched to access the maintenance options. These give you access to the chair's storage (limited to a weight of 50), to the battery compartment, to the mount/remove weapon option, and to the inertial dampers and steering options (see below).

Activate the HoverChair while standing to mount. The default controls are;

Forward key to accelerate
Strafe keys to steer
Activate key to dismount
Jump key for 'Leap' facility
Ready-weapon/Reload key to reload

When you first approach the HoverChair a message will appear prompting you to re-map the HoverChair's controls. This is strongly recommended as it will enable the on-screen compass and health bar, and make sure enemies react to you properly as you're riding.

The vehicle steers like a hovercraft (a 'sliding on ice' effect), so driving in 3rd person view is strongly recommended. Plus the jet engine flare and Falcon8204's chair model look really good! Enabling inertial dampers will make the vehicle easier to handle but will shorten battery life. Turning can be set to accurate (better for aiming the weapon) or responsive (better for quick turns at high speed).

The Hoverchair can run over water as easily as over land. Take it for a cruise along the Potomac, and enjoy the view!

Vault-Tech Industries are proud to announce that the HoverChair chassis is strongly re-inforced, and can deliver crushing blows to the less polite inhabitants of Washington DC. Just Point and Plough, and the HoverChair will do the rest! This is more effective against large, slow moving enemies. Small, agile enemies are more likely to dodge.

Is crushing not enough? If you have a Minigun, Flamer, Missile Launcher or Fat-Man in your inventory you can install it on the Hoverchair. Load the ammo into the chair's storage, and blast away!

The Explosive Salmon feature will allow your HoverChair to leap skywards! Please note this can only be used once every ten seconds or longer.

A quest called 'HoverChair Location' will be added to your quest list. This simply provides a marker to where you last parked the chair. In addition, the chair will appear on your PipBoy map (Vault icon) and can be fast-travelled to.

When you take the remote control from the chair's storage it will be added to your 'aid' inventory; select the remote (left click) and close your inventory to activate it. You can use it to re-map your HoverChair controls to other keys if you prefer, or to call the vehicle to you. This is a short-range call, and is for when you drive into a pit you can't drive out of.

If you park the HoverChair on a steep slope or the edge of a cliff, it may end up upside-down. Don't worry! Vault-Tech Industries Intelligent Recovery Systems, incorporating RobCo AI technology will come to your aid, and self-right the vehicle on activation!

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Just so there's no confusion:
Corehound used the Halo vehicle resource to adapt it to the hoverchair (seen in the latest screenshots). you can find the resource here:

http://www.fallout3nexus.com/downloads/file.php?id=11592