I have decided to sell the marine AC unit, and I purchased one of these:
http://www.amazon.com/Whynter-Portable-Conditioner-Heater-ARC-14SH/dp/B002W87P9C/ref=pd_ybh_2
14,000 BTU, AC, Dehumidifer, fan, heater (1,300 btu heat)
Unit will tuck under stairs, and vent out the engine compartment in two existing vents (no cutting of deck)
The marine AC is 5,000 BTU's, so it was a lot smaller. This may do all the AC needs for my whole sailboat, if I put in forced air vents.
I will put this (below) back on Craigs List where I found it.