I had a DLE 30 do the same thing on a 72" Yak. I just cut the engine box corner off at a 45 and epoxied in a piece of ply to replace it. The plane was made for glow so I also had to cut a whole in the front of the firewall for the carb to stick through also. I removed a lot of material, but so far no problems. It vibrates much less than the Saito 1.80 that was on there before anyway.

David