RE: Small glow twin
Had OS 40 FP two strokes on one of my Twinstar's, the 40 four strokes will work just fine, mount round cowls on it and make it a tail dragger like Sky King's Cessna Bobcat also know as the BAMBOO BOMBER.
The second generation Twinstar has better covering, not that shelve paper crap as on the first versions.
World Models makes a P-82, don't know if they still do, had factory retracts in it.
Friend of mind had one with K&B Screamin 48's in it, talk about fast... FANTASTIC engines.