Actually, that drawing is a perfect place to start.
I can do it one of two ways: either using actual pics of the various parts and configurations, or more like the illustrated one that was posted. The illustrated one will be easier to build, but I'll need to create all the parts in Illustrator, and then build the interface in Flash.
Some of the things that will be options are (in no particular order):
1. Lift / Lower
2. Cut / Uncut
3. Full Hard Top / Half Cab
4. All the softtop configurations
5. Roll cages
6. Wheels
7. Bumpers
8. Tire Carrier
9. Doors (none, hard, soft and cut outs)
10. Paint (w and w/o striping)
11. Lights
... and pretty much anything else I can think of. I'll use pics from the gallery here to get ideas.
This is actually a better one than the one that was posted (and eye candy for you paintballers).
http://www.a5builder.com/?gclid=COnHjYnjz5gCFQw9GgodtGMO1A
As for the vendors, I see no reason I couldn't do something - but let me get the basics down first. Maybe a front and back view as well as the side...