The patch should be a simple matter of grounding the house, the door marker, two NPCs and a note. The IDs of the NPCs and the note start with 'pov' and are just outside the house.
Your mod sounds very good, I'll be sure to play it some time if I ever get Shivering Isles.

http://img.photobucket.com/albums/v189/phoenix7/Oblivion/overview.jpg of the cabin, HotD's ruin, and SotD's temple
The http://img.photobucket.com/albums/v189/phoenix7/Oblivion/cabinbigstep.jpg The door being just like a foot off the ground
The main thing Iwas worried about was the third mod I mentioned it edits these http://img.photobucket.com/albums/v189/phoenix7/Cell-Grid-Map-VorsichtSpoiler.jpg and the area in question looks like http://www.tesnexus.com/downloads/images/25530-2-1246455972.jpg, so yeah lot's of edits there...
I'm not sure it's a big deal though, it's a German mod and there was an English version, but that got taken down.