Regarding "race" specifications.
What are your prices for a full-race configuration with legal roll cage, side-impact protection (meaning NASCAR bars and fuel system fully contained within the chassis) and fuel system for a roller? Each company I have contacted has claimed a "race" version which doesn't turn out to be legal for any racing in the US.
So far the kits I've seen wouldn't be legal for any but the most liberal fun track day organization in the US. Race for trophies in a class and they get pretty picky about things like fuel vapor isolation, crush zones and roll cage tubing specs.
IMHO once you start having to reengineer the chassis and install a cage etc...all the kits are basically equal. I am looking for a car that would pass an SCCA or NASA tech inspection for RACING as built straight out of the container. Given that this means adding a cage to the basic design (a good idea anyway IMHO for a car with a fiberglass roof) and rethinking the whole pontoon fuel setup (a bar above an aluminum tank hasn't been race legal in the US since the 60's), it seems like a natural progression for any basic tube-frame chassis.
Granted I'm doing amateur racing but the requirements are pretty much the same in every racing organization in the US. I could certainly by a completed Radical for $45k US including engine so to make the "cooler" GT40 thing fly it has to be at a pricepoint which is not vastly more expensive than purpose built (and sorted and proven) race cars.
Frankly finding it a bit frustrating. Things like racing brakes and engines and transmissions are expensive but available in huge supply...far more challenging is the problem of what to put them IN.
I had a nice talk with Graham Turner about his UK racing program and it mirrors what I'm trying to do except the safety requirements he has to abide to are liberal in the extreme. In the US (probably due to tort laws and liability) we aren't "free" to choose our own level of risk so have to conform to the sanctioning body rules. The irony is that it seems that a race configured chassis would be the safest street-car configuration also.
If a cage is good enough for a $700,000 Lola original, why isn't it standard in GT40 kits?
Authentic Lola Mk VI with modern safety equipment:
(steps down off soap box). [img]images/icons/tongue.gif[/img]