1)The interior folding table was designed to be removable... unfortunately, leaving it in, especially in a salt-water environment seems to seize the legs in place.
There was a thread a while ago on suggested approaches. The one I remember is to cut the legs off, and find a piece of PVC that will work as a sleeve inside the legs.
2) Flushing waste overboard? hmmm well at least you can't do that on the Great Lakes.
3) I don't think there were any instruments that came with the boat. On Hulll #205 I have Signets. I know you could order compasses from the factory.
4)The boarding ladders I've seen are mounted on the transom. Mine is indeed removable... just pop off a pair of clevis pins.
5) There's a thread on hatch replacement, last posted to on 12-20-2000. It seems like either a Bowmar 910-10 or Lewmar Ocean 10 fit the small hatches, Bowmar 995-10 or Lewmar Ocean 60 for the large. I know Layline caries the Lewmars, and Thrifty Marine in Ft. Lauderdale the Bomars.
Sounds like you'll have a fun spring.