Either you are smoking something real good, or you much much better at electronics than joe average ....
Hmm... I HAVE seen home-built scan doublers, but you're very right, they are NOT easy. (Think, you have to buffer an incoming signal, double the clock-rate, and send it to the monitor twice for each frame... That's a decent bit of circuitry) Nor safe. (Amiga components are fragile, and don't like it if you have a voltage/signal on a line that shouldn't, etc) Nor accurate. (Display not as stable as it should be, very touchy wiring, etc.)
Personally, unless your time and equipment is almost worthless, I'd say it's very likely cheaper to pick one up from Softhut, despite the pricing there.
