The more research I do, the more it looks like its going to be exponentially cheaper to just buy a complete car.
ABSOLUTELY! When I built mine it cost a lot. Probably put $30,000 in car not including Engine, Transmission and Data Logger which I already had. I spent thousands on stainless steel hoses and fittings alone, everything adds up and and it is not cheap. Chassis, wheels, wiring, tires paint, rear end, steering box man it gets expensive quick. Now I did build mine different than most which added a lot to the cost. I have a radiator, water pump, alternator, fan, big transmission cooler, dual remote oil filter, and more so I can bracket race it and hot lap it. That makes it more expensive and heavier than typical FED.
There is a few decent looking cars on Racingjunk right now and mine may be for sale after Christmas. Like I said in other post make sure the car works good as is. No aborted runs and capable of winning races AND SAFE!
I have seen some cars that could not get down the track under full power.
A FED is a total blast to drive but it is a balance of weight, power, Traction, horsepower and must all work together just right.