Entirely agree with this, it's a very nice kit, and a welcome change from the usual stuff. One small word, though. Structurally, it's a Ro.57bis - the dive brakes are included on the etched fret and are lovely. But the armament remains that of the basic Ro.57 - a pair of machine guns. I can't find the extra 20mm cannon anywhere, and it's the devil of a job to find references on the Interweb too.
Nonetheless, well worth getting if you like something esoteric.