I glued styropor into the frame, which I cut to size with a hot wire cutter.
By bending the wire, I then cut ravines and craters into the foam. I tried to make sure that all were small enough, that minis can stand everwhere on the board, even if their base overlaps a depression. They are meant only as optical candy, to make the board more interesting, not as an actual game feature.
With filler, I hid the bubbles on the sides of the depressions.
The gap between the two styrodur sheets I hid with acrylic caulcing.
