Roughing it
I constantly judge the perspective of the layout before anything is completely fixed. That means that the hill and cutting on the station section needs to be roughed out early on.
I took some Bunnings XPS and used a hobby knife to shape the hills roughly.
This is still a work in progress and I find myself constantly adjusting the look of it. Trying to balance the prototype with the curved constraints of the model is a challenge.
Also a challenge is taking care with the knife.