http://www.gamesas.com/bgsforums/index.php?showtopic=971904 <--- sorta
Thanks for the plug
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WanderingRogue, you might also be interested in looking at this http://www.fallout3nexus.com/downloads/file.php?id=6194 mod.
The drawback of my mod is that, while it works well as a hovering vehicle, it's ground detection isn't precise enough to work well as a normal ground vehicle. The motorcycle mod essentially gives the player a piece of armour which has a motorcycle mesh, and modifies the player's run speed.
It might also be possible to create a rideable creature (for example, see the http://www.fallout3nexus.com/downloads/file.php?id=3330 mod) which is motorbike shaped. You'd need to do a lot of practice and learning though. As http://cs.elderscrolls.com/constwiki/index.php/Blender/Custom_Creature says, "this process is not for the faint of heart."
I'm actually thinking of putting together a guide to how my hoverchair works (I've got bogged down in bug fixing on my latest version) which I'll upload to FO3 Nexus. It won't be very soon, though, work's slaying me right now.