Not much different than most high end bikes which don’t come with seats or pedals. Those are two things that cyclists tend to have very firm opinions on and buy separately to ensure they get a proper fit.

Plenty of frames alone are in the several thousand dollar range. https://www.specialized.com/us/en/s-works-tarmac-sl8-frameset/p/216956?color=352185-216956

Wont work cuz of te rear wheel assembly i dont see how it work

bS imaginary paper bike