In attermpting to keep it simple, here is how I plan to model Chiunzi Pass, It is a cheap simple three box solution that will be covered by a green cloth. The boxes will be taped down to the table to prevent movement and then the cloth will be pinned in place (this is important for the roads)
I will also add more smaller boxes(hills) to the top of the pass (box 1) as well as a farmhouse (as used by Derby's rangers so that it is not a flat expanse. The ascent from the North (German) side (box3) should strictly be opposite, but keeping it on this side makes it a more robust construction and easier to play the game without reaching over.
Once I acquire some suitable boxes I'll post a picture