Hmm.. judging by the comments here, I suppose I'm the only one who goes to Hammerfell and sees almost no land. Lots of rocks and trees, and a few buildings (and the models look GREAT btw), but all floating. Maybe my download was corrupt? I have both the ESMs and the ESP loaded.
Ran into the same. I spent quite a bit of time trying to get it into shape on my end, and after dealing with some leftover issues in the file, I managed to get the landscape to show up everywhere, with only one cell of objects not showing up for some reason. Even that one cell had several bits that were visible but was missing major stuff like parts of Rihad's city walls. The entire rest of the mod seems intact at this point. So those files are what I sent back to Lady Nerevar.
I can't see anything in the file itself that would explain it. Makes no sense. But it happens nonetheless.
Arthmoor was actually having a similar problem. He said that making an esp that modifies Hammerfell somehow and loading it fixed the problem somewhat. Its worth a try.
That method would have required an ESP that edited every cell in the ESM. Not practical for obvious reasons. With the remaining glitches I was able to get the missing objects to show up with a separate ESP that edits those. Moved them all down one Z unit and they showed up in game.