Check out the http://www.tesnexus.com/downloads/file.php?id=13237 [adtreehome]. Great mod! There's a Cobl version too. Search Nexus for "Druid".
That is the druid's home I mentioned in my first post. I tried it and found it too magical lol. Plus being a little elf inside a tree I feel the need to bake some cookies lol.
On another note I have decided to forgo looking for a house that is in an exterior cell. I forgot that the rain goes through everything in this game including a roof.
I liked the tree house by Rabina that was linked to 2 posts above. It is a little sparse though so I would also like to find a way to put in a container that takes all your ingredients from you with an activator, and it would be nice to have an enchantment and spell making altar. I also will try to find a way to get a certain door out from under the house and back on a wall. The modder made a goof up and left it.
So if anyone knows how I can get a spell and enchantment making altar and an ingredient taker into this house I would like to hear about it.
Update: I found a way to get a ingredient shelf and the 2 Altars into the house. They look great. Now this place has all the stuff I need. The door that is under the house is actually used in a way that the very top of it shows on the wall to kind of hide it. The Modder stated that they are not very good at lining up doors logically lol. It all still works though, and I don't feel like trying to fix it.
If anyone else knows of any other good tree house mods feel free to post them up. If it doesn't help me it may help someone else later on.