Donal,
Thank you.
I made a gas locker in the Hustler 25.5 I had.
Unfortunately, the space in that boat aft of the cockpit lockers was restricted. The only solution was to use a round hatch, with a cylindrical grp moulding beneath. The size of the camping gaz cylinder was about 3mm dia larger then the only hatch that would fit, so I could not use the hatch outer, and had to mould a grp ring. This meant that the "o" ring would not fit, and there was a lot of grp filling and finishing to do.
I do not want to repeat that excercise.
I do not own that boat anymore and have no photogtaphs of the installation.
Boat is in Cork, owner Peter Webster, on ptbw AT gofree.indigo.ie.
I am sure that he would send you pictures if it would help you.
I note that the boat tested, "Elsa" in Sept 2000 "Sailing Today" appears to have a gas locker behind the port cockpit locker.
Can send you scan if you would like email fdmarsden AT aol.com
Frank Marsden
Frank Marsden