It's been done previously in Cyprus as well (I think EP95 based), and again in Japan (who Enzo is using as motivation).
EP95 would be an easier starting base as it has the humped sump and fuel tank, as well as the tunnel in the floorpan, but the stock drivetrain I would think is rather inadequaste for use as a standalone RWD platform, but you're limited with gearboxes due to the transverse mounting of the engine - the Subarus are longitudinally mounted so are much easier to adapt to existing RWD gearboxes. Longitudinally mounted EP's have been done before, but its an awful lot of work!