kingtight, I have a 26 gasser that fits nicely...only problems is the exhaust. There is not enough room underneath the engine for the muffler due to the nose retract cavity being under the cowl as well. It would have been nice if KMP would have gotten together with an engine manufacture to have the right engine/plane combination like the guys at Experimental Aircraft did with Bisson on the pusher configuration for the Velocity plane. Bisson made the awesome mufflers at the angle required for the engines installed like the webra 120. Excellent team work. As of yet I have NO clue as to anyone having an all incowl engine on this plane or has anyone posted any videos of it flying. Bummer really.....