The main gear fairings attribute to as much as 15 mph of additional speed. About 3 times that of the wheel fairings, believe it or not. Therefore these are essential, however very critical from an alignment standpoint. These act as miniature ailerons and the slightest mis-alignment will throw the slip ball out of wack and require compensating rudder.
The process is to fit the gear fairing, then the wheel fairings and then construct smaller transitional fairings between the wheel and gear and between the fuselage and gear. Vans offers pre-fabricated transitional fairing which I have already purchased, since im not too crafty with fiberglass layups. They appear that they will fit relatively well.
