Here are pictures of the innards and the engine mounted, excuse the nasty paint job on the spinner, the 60 is almost too much power for this (if there is such a thing) but the engine is a perfect fit for the mounts, you would have to build an adapter of some kind to mount a smaller engine, if you go electric you would have to cut out the engine mount, wich reminds me, one thing I had to do was add some of the covering on the bottom of the rudder and in the split between the ailerons and wing, I am a little paranoid of getting fuel soaking of the balsa, in the second picture is thre wing mount, I put a piece of basswood under the rails and put pieces under it to keep the wings together then had hooks under the wings that slid under it and the wing bolts kept it slid forward, that was the thery anyway. I may try to rig up some kind of other deal to mount the wings.