There are a couple of build threads for landspeeders on here.
A build thread for a Tumbler Batmobile by Doody.
Creebobby is doing a build making a 66 batmobile from a Miata
Matt Munson is doing an 89 Batmobile currently
donc has an 89 Batmobile thread up.
Just do a forum search for a vehicle you are looking for and you might find something. These listed are just the ones I could think of off the top of my head.
Plus I think these threads are in the prop forum rather than the Gen. Mod. forum