Ames has full frame rails for $229 each. I don't know how laws go for our northern neighbors, but there can be a problem with reproduced 69 camaros in the US. Maybe home built could be exempt. (But you didn't build the chassis, so it isn't a home built car.) The problem, however, is that the production date of the chassis is about 11/24/05. In order for a vehicle to be street leagle, it has to meet the emission specifications that in effect for the production year. That means, it has to meet 2005 emission standards. If you want to get real nit pickey--but I don't think that they get that drastic--if you have an 05 production-datee engine in a car, it has to meet 05 emission stadards. Simply, the vehicle or the engine, whichever is newer, must comply to emission laws.
I'm not sure of all the fine details. I do know for fact that this is federal law, and it's been on the books for over 30 years.
You also have an issue of vin. I guess you could use a "donor," but that becomes a shaky investment because you have an illeagle car.
The point is that you want to do some homework before you buy a new chassis. One way around it would be to graft a donor firewall in the new chassis. (If the emission thing is an issue and I were making the cars, as an option, I would make it minus the firewall, making it easy to make it a legitimate car. You loose vin numbers on some metal replacment--such as frame rails-- so what's the big deal?) That way, no one could argue the point that you replaced all the sheet metal on the "old car."