Today I finished building all the parts I needed to show the Gate Tower setup. So this is the Rohan Watchtower.
On its own it can be used as a watchtower out in the vast lands of Rohan but if you add the gate parts you can assemble the Rohan Gate and incorporate it into the Rohan walls and towers using the other parts we have so far.
If you want to build it yourself download it here: The Rohan Watchtower.