Hi
I agree with all previous input about painting, although I used, and would recommend a one part polyurethane (can't remember if it was Petit or Interlux). It's easy to apply and has stood up well- three years and still looks new. Good sanding is essential to get a surface the paint can bond to. I also found that painting highlights any imperfections so good prep and fairing will result in a nicer finish, but that's not a big surprise. If you're looking to retain some "wood" interior besides the trim, the formicas (and equivalents) now available are much nicer and more real looking than what was available in the sixties and require virtually no maintenance. You can find them at any Home Depot of such place. My interior trim is all mahogany, not teak, and matches almost perfectly the formica I used on the countertop.
And if you're looking to make the interior brighter, consider finding a small portlight that you can put in a companionway hatchboard. A little bit of light from another direction makes a huge difference. Plus it's nice to be able to peer up from the quarterberth and see if the weather is cooperating enough to make getting out of be worthwhile. Tom