This is my initial attempt at making a wheeled Rhino chassis. I've been learning a lot about using Google Sketchup to design and print objects. Overall, I was pleased with the result, but I think the aesthetic is a little off. It looks more like a generic sci-fi transport to me than it does a Warhammer 40k transport. The front in particular doesn't scream Space Marines to me.
I did include one photo of the un-assembled model. It's hard to see, but there are tabs on the side of the body and slots on the side of the side pieces. You don't have to line up anything... just dab glue on the slots/tabs and stick together. The goal was to make these EASY to assemble and somewhat modular. I had to print the sides flat to eliminate any overhangs. 3D printers don't like overhangs!