First up with the positioning the units on the board to get a layout that looks nice.
I then added a few simple geometric shapes to add height and interest to the board. All the shapes corners were rounded over to give an unnatural look.
Using apoxie sculpt I added some organic rocky formations to match the bases of the models. I had to be careful how many I added to avoid wasting to much usable space. You may notice the cut line down the middle of the board - this board folds up to fit in a suit case. The center triangle piece is attached with magnets.
To prove that not all ideas work I dropped the "shark fin".
In lieu of the "shark fin" I started on the first layer of the back drop.
I added additional layers to give the sense of geometric mountains out in the distance.
Just as the bases I painted the whole thing in black followed by many, many layers of Gloss Medium to give it a high polished shine. Here is the finished board.