I have made some more progress. I've started carving the rock cliffs and laid the 3' gauge track. Currently I have mock ups for the buildings and trestle.
My plan is to build some log cribbing like this.
I collected some ponderosa pine twigs to make the cribbing but am unsure they will work. It seems hard to find ones straight enough and without insect damage. I think I will try looking for another species. I hope I can find something that will look correct. I am a little concerned about the amount of cribbing visually and may extend the trestle or something else.