what would it really take?

I agree that taking a "Race car" back to a street friendly status is a big chore and probably on the level of not worth the effort. The one you listed is really nice and it could be done easy enuff. The interior and such is easy. It's just money spent on line or in a catalog. Installing gauges really isn't to hard for a new guy to do. They could all be done in aftermarket units.

The next big pain is the drive train. This is where the balanced gets tip in favor of a different car. Re-doing a drive train for the street is going to cost a lot of money on top of what it all ready needs.

If you don't mind throwing money at a problem, then it is a OK car to do.

Perhaps you can get the car and just enjoy it at the track only as a track only car.