You won't find any car kits in 1/35 except or the Tamiya Citreon Traction Avant and a couple German WWII staff cars. Your best bet is still the 1/32 models or diecast ones. There are some '57 Chevy and other 1/32 plastic models as I posted above. Modifying die-cast ones isn't that hard nor does it require any special tools. I modified a die-cast 1/34th Cadillac Escalade into a torn up armored Suburban in Iraq. I used normal modeling tools (Dremel for cutting open the rear passenger door, sand paper, A&B putty, sheet styrene, etc...)
Here it is in progress...
and completed.
Its not that hard. I say go for it.
AARGGGHHH!!, damn bandwidth!! Check this album
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
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"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell