AFAIK the Buchón was designed for a Hispano-Suiza, but ended up using a Merlin which spun in the opposite direction. That forced some changes on the fuselage and flying surfaces, but I've never heard about any modifications on the landing gear at all.
From what I remember it had the same vices as any other narrow-geared fighter during takeoff and landing, but that was never a serious issue for the pilots.
While the aircraft used a Bf-109G2 airframe, the new engine gave it performance that surpassed the G-6 in every respect except range and maximum ceiling. And all that while carrying two Hispanos on the wings and eight rocket launchers, no bomb racks or drop tanks were ever used. I guess range isn't really a problem when most targets are in your own country, even in your town. The magic of a civil war...