TAZ the Shade Tree Mechanics DID build a Cobra on TV (I think it was waaay back in 1999). They built a Lone Star. From what I recall, it was about as useful that what these guys are posting about the FYI show:
"OK, while I tighten up these motor mounts, Joe will install the wiring harness and gauges. After the break, we'll install the rear end, fuel tank and lines...!"
30 minutes later and two guys finished an entire car, without one skinned knuckle or even dirt under their fingernails.