It has been a while since I went through this with my Chenowth, but here goes. You will be dealing with the DMV and the CHP. The DMV will be registering the vehicle as something like a "specially constructed vehicle". You need paperwork to support where the parts came from, like receipts. Receipts, because they are going to charge you fees based on what the vehicle is worth. I wouldn't be bragging about any high $$ Parts at that point. They will then need a CHP inspection at which time they issue a VIN plate that is attached to the frame. Do the frames have VIN numbers yet? If so you might be looking at a renewal. Anyway, if you can show where everything came from and it passes the CHP inspection you should be OK. Oh, Yeah, don't flat tow an unregistered vehicle to go see the CHP folks.