I would do it for the fun of it. I started down this road about a year ago and am having a blast. My journey started when a friend gave me a slightly used Poulan chain saw with a 2.0 cu in motor in it (33cc). I already had one so, being an RC junky I figured I'd try to build one. I went the glow route as I found the magneto was attached to the case of the saw rather than the engine. If you stay with gas their are plenty of motors that have the magneto attached to the block. I spent $15 on an glow adapter and $20 on a prop hub and that is about all I've invested, other than time. My big bore glow motor will spin an APC 18-10 at 7800 and weighs about 2-3 lbs (a guess) with the stock steel exhaust. I still haven't built the big SPAD for it yet, but playing around with a motor that used to run on gas and now runs on Methanol or standard glow fuel is allot of fun. I even used the stock WT-324 with some slight internal mods to flow more fuel. It's definately much cheaper than a Fuji, DA or BME. The saws are really good for power but you can find some good weedy motors that produce good power. Have fun!!![&:]