Trying to convert this mod

The Project Master is not compatible with Morrowind Mods. If you use the Project Master, then you would not get the benefit of the mod anyway, since the mod would be in the Morrowind_ob.esm file that gets replaced... Plus, mods may cause missing meshes. Plus, they may crash your converter :)

That is the downside of the way this whole conversion thing works. Making a conversion of a big mod like the one Bigfoot is talking about for Silgrad Tower would be THOUSANDS of hours of work.