Necro post....
I havent see you around, so not sure if you're still in the hobby, but i was on amazon and just ran across an M35 cab, with a bobtail bed, on a crawler chassis, for about $55.
Search for 'Injora 1/16 millitary'
Guts are firmly toy grade, but the body looks good for a bobtail. Missing a few details, but beats scratch building everything.
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http://www.scale4x4rc.org/forums/showthread.php?t=20373 m35 build in 1/10, good resource