It can be done. If you search the posts for a 16cc Echo/Kioritz you will find the info about the one I did a couple of years ago. I wouldn't do it again as the engine weighs the same as a 21, 22, or 23cc Kioritz and doesn't have much power. It flew my 10 lb. airplane adequately, no great vertical but aerobatic, at sea level but was underpowered when I moved to an elevation of 4400 feet. (And this was all with hop up modifications.) I would vote for the swamp boat idea. I don't know that you could build a 6 lb. airplane with an almost 3 lb. motor that would hold together!

AV8TOR