I'M MAKING THESE CHANGES TO THE PLANS:
1. Instead of a Lycoming 360 Engine, a 20b Mazda Rotary Engine (water cooled, 3 rotor - see animation below).
HOW A ROTARY ENGINE WORKS
2. Wider pre-fabricated upper Fuselage from AeroCad.
3. Slightly rounded Windows (compare image below with home page).
or an even more rounded, porthole type, rear window: