What do u mean build a F1 chassis? Wouldnt u just need to find a body that fits on the regualr chassis? Whats going to be different about the one that u plan to build? You could try searching for stock car bodies, im not sure if they would fit though.
I mean buy a F1 body and build a chassis like the ones for TTTT. I would make it out of brass wire. I would build one for fun and then build one with suspension and stuff!