Hey guys, don't get in a tail spin, I never said that these were ugly. I happen to like their lines myself, I only meant that they look very cartoonish, just like the Polikarpov I-15 and I-16s. In fact, I modified the old Airfix F2A-1 to an F2A-3 and was lucky enough to take an award for it at a local model contest.
The Boomerang was not a modified T-6 or SNJ. It was a new fighter aircraft which used the wings, tail, and engine of the their license-built North American NA-16 trainer, called Wirraway, and a fuselage of their own design.
As for the Buffalo, Brewster should have stuck with building Rolls Royce car bodies, for all it contributed to the war effort.