Well, so far we have:
- Duke It Out In D.C. HRP by NightFright: This one has the most progress so far, but it is also the easiest, requiring no UnDEF code (except for the title screen, fonts, and end of level screen).
- Duke Caribbean HRP by Parkar(?): Not much is done, but it does have some basic maphacks and UnDEF code.
- Nuclear Winter HRP by Hendricks266: Work is being done, but I don't plan to release it until I check over the UnDEF code. We also need a maphacker. The first two levels should be easy because they are clones\rip-offs of E1L1 and E1L2.
Duke!ZONE II is basically Duke!ZONE I, but with more maps. Duke Xtreme and Duke!ZONE I\II didn't really have any story or background. They are really just DM maps with a few SP thrown in. I don't have them, so they might not even have any extra art.
I think that there should also be HRPs for Wanton Destruction and Twin Dragon (and Deadly Kiss if it was finished) for SW.