I think one of the first things we need to address is if we'll be using any modder's resources/ mod permissions for assets. If so, we might do well to search a few of these out to save time. Morrowind has so many resource packs, and so few modders are willing to work with them. I think it would be wise to at least consider.
Also, what is the situation on the different forms of Khajiit? I don't see many of them listed. (eg Dagi and Cathay) Also, I think a dro-m'athra (from ESO) enemy would be very simple to implement. It would just be a khajiit with dark, ghost effects. Plus they'd make an interesting enemy for a potential Temple questline.