Amazing that all of these planes are Alfa powered. With all of these planes built, one begins to wonder why AR stopped building production airplane engines. Most likely it was a 'bottom' line issue and not cost effective. With most defunct engine builders, one has to resort to custom fabrication of parts to keep them flying. I wonder if there is a supplier of AR engine parts for these aircraft?
Is there a European version of "Trade-A-Plane" ? I wonder if a person could find a AR powered plane?
Again, I would very seriously consider selling the whole lot of cars and parts for a flyable AR powered airplane. It would be kinda hard to take to a convention.

Think I could win in my class?

The Breda would be my favorite...looks along the lines of an Alfa Romeo SZ for an airplane. The Ambrosini would be more like a TZ do you suppose?
Did you notice the lack of visual dihedral in the Caproni 602 and 603? I wonder how that 602 would be for stability with out the apparent lack of dihedral? The 603 with that big tail would be wicked for doing spins...flip right over in a heart beat and around she goes.