Originally Posted by
AlmostTrick
I recant my "you may be right".
After going back and inspecting the set up on my Raleigh Wyoming coaster brake, (it's been several years since I built it up) there is more than enough adjustability in the semi vertical drop out to compensate for a normal amount of chain stretch.
I post this not for the OP, who has decided a new frame is what he wants or needs, but for those readers who may not want to buy a new frame when the one they have may work just fine.
It seems at least one expert backs up my assertion:
Sheldon on Singlespeed Bicycle Conversions
Of course, anything can be "improvised and made to fit", but it doesn't mean that it's an ideal long term solution. I would still argue that the best thing to do is to use a proper frame. Do it right the first time.