Here are a couple of other mods.
The BR-549 was my first mod with larger wheels, a P-51 motor, tail wheel on the fuselage and wings struts to take some of the dihedral out to make it easier to fly upside down.
The Texan was my second biplane. I moved the wings back 3/8" to balance the CG for the second wing and crop dusting was perfect. With the P-51 motor it could do 11 loops in a row before loosing power.