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Looks good!

It would be easy to make a double-height wall, but the existing parts don't interface well with that, so it wouldn't be properly modular.

I see three challenges there:

  • Gaps between high walls and towers etc., as the interface is only defined at lower level.
  • Transition between high walls and normal walls
  • Accessiblity of high-wall battlements

Thinking about it, maybe "flat-topped" standard walls could solve some of the problems. Basically a standard wall cut off a bit below the merlons, and with vertical pins so that you can put another standard wall on top of it, or a section of merlons to get it to standard height.