Things with wheels that are cool
The gas tank looks like it's from an old (40s to 50s era) tractor.
very cool windshield...
The engine, rear end and 'Duvall-esque' windscreen are pretty neat; the rest...not so much imho. Agreed on the source for the tank - and it just doesnt 'make it' - again, only my humble opinion. The car just doesnt look finished - looks like they strapped a tank and a battery on just to take it around the block and see it it runs. Of course, if thats the look they were going for, SUCCESS!
I'd say the gas tank was from an 40s Allis Chalmers "B" type tractor.