So with all of the 944/951 go-fast parts you are stuck with developing everything yourself? The struts, shocks, bushings, torsion bars, ARB's etc. are not common? Compared with my Volvo 240 you probably have 1000% more aftermarket parts to build an ITB car with. It's definitely not a bimmer, but not without some aftermarket love.

Not sold on the aero, but without complete info it's a moot point. Many would argue that a MacPherson strut and semi-trailing arm are never "excellent." The Porsche engineer's gave you the 924, that in your estimation is a good basis for an ITB car.