Another thing to try is a hobby chisel, which is usually my first tool of choice with my 1/700 ships (talk about
no room to manuever). I got mine from
Micro-Mark, and if you don't use too much force, you can remove a watertight door with one or two swipes and have a clean surface remaining. If you do use too much force, or the chisel happens to slip, well ... Band-Aids are
always a good thing to have on your workbench.