Seriously there is no better deal going in a fun street/track car right now. Clean 02+ C5Z06s are down in the low-low 20s. You’ll see slightly higher mileage cars, or '01s, in the high teens now. Or get a FRC for mid/low-teens and just build it.
I have no idea, I can ask. I haven’t actually been to the shop myself, I’m still in Afghanistan. I found the builder through a racing buddy who has the '04 CE Z06 pictured previously w/ the completed cage. The work was top notch (I saw the car in person last time I was home) and the price was right so I had my car sent over.
-TJ