I didn't mean the entirety, just the really awesome cities/towers, like Minas Tirith. Also, it is incredibly awesome that you have maps for almost everything from LoTR, though this makes me ponder something. Is it just maps of LoTR, or maps of things from oh lets say, The Sillmilarian. Morgoth's two bases would be fun and Fun to build.
Alright, then I won't do Barad-dûr. I guess I have to think of something then still 
But yes, hello.
Wait, the above reply was meant as a joke. I didn't mean to stop you from building Barad-dur.
There's space enough in the world for many Barad-durs. And Orthancs. And Towers of Ecthelion. And Sorcery Towers. And Cirith-Ungols. And lots of others.
An idea comes to mind, though.
What about a complete recreation of Moria, I mean, Khazad-dum? It should include at least an artifact stone door (the Doors of Durin), a fully engraved chamber containing the bookkeeper's office(the Chamber of Mazarbul), a gargantuan chamber supported by endless rows of pillars(the seventh hall), a single-tile-wide bridge spanning a chasm(Bridge of Khazad-dum), and a great gate of stone and metal that overlooks a brook and a waterfall (Drimrill Gate). Oh, and don't forget the Endless Stair 
Took too long writing this reply! And yes, Khazad-dum is a MUST!
Most of my LoTR maps are just from LoTR, I've had no luck finding detailed Sillmilarion maps. I'm sure they're out there. I don't really want to build something from LoTR in all seriousness, I mean, it'd be really cool, but it wouldn't be.
Of course, I could use one of my own (created by me) maps/worlds and be able to put more detail into it than the game is capable of with no limitations of silly things like having to get it right.
Because if I built Minas Tirith and got it wrong even slightly, everyone would know.
If I built Blackstone City* and got it wrong, no one would notice.
*Blackstone city is, funny enough, a mining-based city. It would fit so well. They even have a
volcano problem.
I'll still probably build Khazad-dum too.