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As you can see, I've been playing around with the newest version of Google SketchUp. I'm using my "hometown" arena for Monster Jam, the DCU Center (nee Worcester Centrum)
(or as Google puts it, Wocester Centrum) as a means to learn it. I'm starting to figure out how the push/pull geometry system works, and how I can work with it rather than against it. As you can see, the results are actually pretty impressive - I believe any schmuck could do what I have done so far.
Now, as to MTM2, up until recently SketchUp was a no-go. Unless you put down the money for the Pro version, you could only save as the program's proprietary format or as a KMZ file for Earth. But, some searching has found a Ruby script which runs within the program to export models as the BinEdit-friendly OBJ: http://sketchuptips.blogspot.com/2007/01/wavefront-obj-exporter.html
. Suddenly, it becomes a great program for doing buildings, arenas, simple vehicles and other scenery objects, not to mention some basic truck parts, and I can think of some ways to make a truck chassis with it. Truck bodies may be out of reach, though (gotta experiment more). Just create, export as OBJ, import into BE, resize as necessary, texture map, and save as a BIN. This makes SketchUp yet another option for modelers, and one that so far I feel has a distinct advantage over Anim8tor, zMod, and BE for certain types of model.