It all depends on what sort of person you are- i get just as much satisfaction out of the time spent late at night in my shop carving an airplane powerplant out of a raggedy chainsaw engine as I do
flying the darn thing- I'd just as soon mount the engine to a bench and run it and tune on it as I would to drag something to the field and fly. I can tinker with the engine at night- or in a spare hour here and there- flying can only happen on a weekend and involves a mini road trip- and I don't get many of them with that much spare time these days.

Conversions are for "engine guys"- period. If you don't have the deep, burning, engine-tinkering mentality- then go buy a ready made one.

It's not so much the money as the accomplishment and satisfaction- plus its not easy for me to spend $400 all at once. But- I can spend it over a period of months- on this little piece and that little piece-
you guys know how that works.

I have a small lathe and mill. I can make anything I need to within reason- I have never bought a mount, prop hub, or muffler. I am trying to get geared up to make my own ignitions.

I have been doing this for years, but just for ref- I can take a $140 poulan from Lowes, buy $120 worth of ignition parts and in my spare time build EVERYTHING else- and I end up with a sweet-running powerhouse.

Worth it???? YEAH.