Welcome back to the forum.
Unfortunately, I see several potential problems based on assumptions I have to make. First, you will need at least 2 lifts to get into the center of your loops, one on each end (assuming you want to avoid duckunders). But, assuming the orange line represents your elevated mountain line, the lift down there looks like it will entail raising mountains, not an easy feat. Second, with such wide curves on the mainlines, and assuming you will eventually run longer cars and engines, it is kind of pointless to use O31 curves in yards and sidings. I would recommend using O72 minimum curves everywhere. Finally, you say you want industries and scenery, put your track plan doesn't seem to leave much room for them except as backdrops.
Just thinking out loud here.
Chuck
