The Hornburg is quite tall, so there is plenty of room inside the levels. In addition to the stables, I will add the armory (as seen in the computer game and in the movie), plus also a kitchen under the inner courtyard. There will also be a small bedroom, perhaps for the chef and his assistant.
There will be two spiral staircases; the first connects the stables to the Great Hall above, and also to the room above the column courtyard (i.e. the room whose windows are in the Keep facade). Another staircase is behind a hidden door, and connects the stables to the Glittering Caves below. The former staircase is marked by the Pringles can, and the latter by the duct tape roll. I will use Hirst Arts blocks to construct the spiral stairs.
The behind-the-facade-windows room gets to be Erkenbrand's room - after all, he's the master of the Hornburg. The size of the room can be seen in this photo:
Here are some Thomarillion furniture to go with the small bedroom near kitchen on the ground level, as well as with Erkenbrand's room upstairs.
Here is a nice laser-cut cart, and Thomarillion tools & trough to go into the stables:
A weapons bench and a tavern table from Thomarillion for the Armory (I will also scratch-build some weapon / shield racks):
... and the photo also shows a Ral Partha banquet table for the Great Hall. A number of Thomarillion torches will be used all around Hornburg. In addition, plenty of barrels and chests will be strewn here and there across the Hornburg:
I will make the tower break into three parts for easier transport and storage; I will insert a small speaker and an MP3 player inside the tower to replicate the sound of the horn of Helm Hammerhand... it can be used both in gameplay, and I'll have it on a loop to play it, say, every 15 minutes or so during the model show next year (provided I finish the terrain and the associated Isengard & Rohan figures in time).
Speaking of figures, here's a starting photo taken during a hot summer day - what could be more enjoyable way to spend it than sit in a shade on a balcony cleaning up Isengard figures:
After a relatively fast start with warg riders, I got bogged down by Finecast crossbow Uruk-hai...
I have also a casting station in the garage - some parts are used in Helm's Deep, the most goes to ruined Osgiliath - the construction of that will begin much later (but at least I have lots of blocks by then).
That's it for now - stay tuned for more Helm's Deep later in July...