Go on.
You know that you want to.

No I really don't.....

However to bring the project back on track here is my first attempt at modelling tthe buttes that will form the basis of my terrain boards.
First is the butte tower, made up of two tubes of cork bark on a foamboard base.

This obviously needs to sit on a sloping base so I roughly shaped a 50mm piece of blue foam to provide the base.

Most buttes seem to feature layers of harder rock, giving a shelf like appearance, so I cut another piece of foamboard to provide this.

And another layer of base, again blue foam, this time a 25mm layer.

The towrs will sit on top of this giving roughly this sort of appearance.

I an not sure if I need another layer, but I will experiment this afternoon and see how it looks. Obviously the layers need a lot of sanding and aligning and a lot of scree, boulders and of course the tops added but I hope you get the idea of what it will look like once it is finished.
I will post some more WIP shots as it takes shape.