Spent a couple of hours dicking around in SCARM and got something that I think hits up all my layout requirements
>Something more than just a simple loop with sidings that fits on a 3' X 6' board
>(Mostly) two-rail operation (I could probably make it completely two-rail but I ran out of available parts to use in the free version of SCARM and I kinda like the way the single track through the mountain looks)
>A station area and plenty of industries to work from, including one on top of a mountain
>A bridge and a water feature
>An off-table connection for staging that's also T-Trak module compatible.
This looks a lot better than the layout I came up with a few months ago, so I'm probably gonna go forward with this one once I get the space to work on it.