Too bad those are all tube frame cars. Prohibited by Outlaw 10.5.
These Vettes in questions are "actual" Corvettes. No VIN required because they allow body-in-white cars, but most of them have a VIN Number. These vehicles have to come from a major assembly line.
Factory quarter panels and roof required with factory dimensions. All factory pillar post and door jams must be present. No tube frames cars, must have a stock looking dash. All lights have to be there and be functional. Factory firewall in stock location required. Backhalves allowed, but front frame rails have to be stock, and front suspension has to be stock or of a bolt-on aftermarket variety. Auto with converter or clutch type tranny only. Exhaust with muffler required, exiting after the front wheel.
Since they have a Vin, Corvette body, Corvette Frame, and at least the front suspension, and are not allowed to be a "shell," and can be street driven, how is this not a Corvette? Yes, it is a race car, and no you wouldn't want to drive it on the street (and it wouldn't be legal, but neither is yours). But these are real Corvettes.