I just built me a short driver, 44". Not for driving holes, but for those pesky 175 yd. Par 3 holes. Used an old Power Play 3000, 10.5 driver head; only about 350cc it looks like. Heavier (for me) shaft @ 67gr., plus added 7 gr. to head.
Should be interesting IF I can hit it straight enough. Details after next round.