Oh I didn't even reply, what's wrong with me.
I just finished modifying and testing. It's in SR repo as Wnt18-MountPen.
I changed scenery to WinterWet, mainly look changed.
Did some road fixes, made it broader. Now has few surfaces: slippery in high parts on snow and ice, more grip on green road.
Reversed it, has better views, at least in low parts.