Thanks everyone, usually I don't get that many replies so fast.
Ok, a few months ago I bought this 21st Century tank thing at Walmart for $30.00, it was regularly about $40.00. It was around Christmas when I couldn't find any ROTS stuff, and I just wanted to buy something, thinking I could customize it.
First thing I did was remove the treads and the wheels (total pain to do) then I used columns from some Ultarama's for the bottom sides to make it look like a hovercraft/speeder vehicle and cover up the axles where the treads were.
Then added lots of greeblies to it like backpacks on the side for the clones to use, some sort of plastic pieces on the back sides that I've been saving for engines, and parts of accessories like the cannon, the radar dish, the pivoting duel blaster, and the astromech head, and even used a base stand from a McQuarrie Stormtrooper for part on the top of it.
Then I spray painted it gray, two coats. Then black, and then one more of gray. Then I dry brushed with white, did a black wash on some parts, and then finally some details like the blue outlines on the radar dish and the red dots for lights.
Then I used matte acrylic sealer spray.
Overall it's a pretty durable vehicle, and I'm pretty happy with it. But low on space! For now I think it's gonna go in my Kashyyyk battle scene.