If your search these threads you'll find a lot of discussion on this issue - including pics of some installations on boats that have no "proper" propane locker...
Having lived with a pressurized alcohol stove for 12 years for all the "right" reasons, our latest boat has propane and honestly we'd never go back.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"