This is a project that I've been working on for nearly a year now; actually much longer when you consider the various custom tilesets and placeables I put together for it to use. The goal is to re-create the much touted NWN Hordes of the Underdark (HotU) campaign so that it can be run in the NWN2 engine. It won't be an exact duplicate, but will be close enough so that players who have previously completed the NWN campaign will recognize many of the elements. Thus far I'm working on the first chapter and I'm perhaps 30-40% of the way through. The introductory areas of Waterdeep have been completed, along with the cut scenes, encounters, shops, conversations, and opening battles. The player can now enter the underground landing and make their way into dungeon.
The build will be replete with custom content. In addition to placeables from hak packs on this site, I'm adding in many new models as needed. For example, I've been taking Callisters very nice Dungeon tileset and adding in my own tile variants to reproduce some of the unique landscape elements. 4760 has been very helpful in supplying new creatures that appeared in HotU, and I'll be using those throughout. I've also gained a lot more familiarity with the visual effects editor so that I can add custom effects as needed.
All told this is going to take a while to complete, but progress thus far has been good and I have high hopes for completing at least the first chapter of the campaign within the next couple of years. Maybe.