Well yes of course its possible in fact thats almost all that my mk1 clio is I bought a secondhand shell with a cage already in it, secondhand engine and box, made my own RS2 style inlet from a secondhand carb manifold and a pulsar plenum I had laying about, the old management off the huge spec engine from my nova, secondhand wheels etc.
Even my Dash2 and datalogger were secondhand leftovers from other peoples projects.
Far cheaper than buying everything new.