When you do it, a couple of things:
Obviously 316 stainless for the hinge and the latch (maybe reuse yours if in good shape?)
If you've seen my other posts, you know that I have put deckadence "carpet" on my floor. If you are inclined to do the same, then leave about 3/4" off the bottom of the door so it will open over that. Modify to match if you do something else.
Good luck, doesn't sound like a super hard project.