dbone
Whatja gonna use for an engine? I acquired a 7.5 HP single cylinder air cooled outboard motor and tore the engine off and decided that, yes indeed, it can be mounted in a Tom Thumb frame. Runs good and has a spark advance! In any case the motor can't be very tall. That is why the original motor in a Tom Thumb was a tiny Ohlsen-Rice two stroke. After a long stent of looking at eBay I came to the conclusion that there are far too many people welling to pay a lot more money than I. $300 to$400 for a really nice one was not uncommon. I am sure that I'm going to build one but absolutely no way to start until sometime next winter.