Well, I have found the 'bottom' of my model finally. You can see in this render that there is a clearly defined end to the model. I will do a couple layers of fog obscuring everything below this point.

There is a new building on the left hand side. I will adjust the textures to work a little better with the environment and give it a new roof texture. Its going to get a radar dish of some sort and a bunch of antennas on it. The map ends a little to the left of this building and a little lower on another terrace.

I will now work my way around the model and finish the exterior, then start working my way into the model. I have left locations for entrances, but I will wait until the entire model is done before I finalize them.

Well, as I add more stuff to the level, I am trying out some different moods at the same time.

Not sure if I like this so much, but might be an interesting way to go.

Fleshing out the mountain and deciding on some paths to additional areas in the level.

Love the glowing materials in unreal!

I am starting to tie my scene together a little more with a couple new materials and some more finished geometry.

I need to think about how I am going to light the scene and start working out a fixture or set of fixtures.

Here is an update ingame in the same spot (dont mind the 'lighting needs to be rebuilt' message, thats pretty obvious).

Another update with a better lighting system setup

I am gradually replacing the greyblock geometry with finished geometry.

You can see my progress here