You're going to need to be a little more specific than just saying "fittings". Please provide more information.
You're going to have to search. No one on here really does 1/72. I'd look up the Queen's Own group (mostly in Washington State, I think), they do 1/72, although their website has looked dead for a while. If you do Spanish, try talking to Flota Cruz del Sur, an active Argentine 1/72 group. they're a lot more active, got some nice looking boats, too!
Maybe someone with a 3D printer could print them. have you tried drawing what you want in Sketchup and looking for someone who can print them? Doors and such shouldn't take too much material and would therefore be pretty cheap.
