As I have said in the past, I am a firm believer that the small, rather sad looking polystyrene, or similar, pimples that adorn many wargames tables are not hills in any reasonable sense of the word in any ground scale that's even close to 1:1. Time to build a big hill and put my money where my mouth is.
That's most of an A1 sheet of 10mm foam board: essentially it's about 2' x 3' before the shaping. The ribs are more foamboard, and the plateau is a chunk of 50mm craft foam I had spare from another scenery experiment (of which more later).
It's designed to fit a board corner. The next stages are screwed up newspaper, some more ribs and some masking tape, and then some Woodland Scenics plaster bandage.
My one worry is keeping it flat - that size of foam board tends to flex, but the plaster etc. should keep it rigid once it's done. Sadly, the workshop floor isn't quite flat, so before I apply any paint or PVA I'm going to have to clear some space and move it to the bench.