Decided to scratch 80% of what I had planned and just get on with it

The only thing that hasn't changed is the setting: Kyushu, Japan. I want to loosely base the layout on the Hisatsu line; mountains, tunnels, rivers, bridges and it has the only switchback and loop in Japan atOkoba station.
Here is the track plan and some flex track. I've intentionally kept lots of empty space because I planned to have a second track run there. The straight bit at the top would become a station eventually. I've parked the thought of a second track for now; decided not to bother with points at the moment, so it's kind of pointless (pun intended) to even think about building the switchback and loop. Added the base layer of XPS, using some smaller bits to raise the track. Decided to make a few changes to the initial plan here.
-the inner turn on the right has been flipped
-both inner turns now run under the outer turn, doubling the number of times the track crosses itself.
-the outer turn on the right has been raised more to add more variation in height
-less straight bits, more variation in radii
-moved the track away from the wall a bit Right now I'm in the process of replacing all the XPS blocks with proper layers, slowly building up the landscape while trying to figure out which features should go where. I'm just winging it to be honest.

