Playing with Polystyrene

 I have bought a box of 600 x 400 x 25mm polystyrene packing sheets to use as the base of the table and give me a sunked ditch.

Spent some time today playing with how it might look.  I need to work out the Glacis before I have an exact idea of the siege lines side of the ditch.  But I think it looks deep enough.  The Ravelins, etc will also be raised out of the ditch as well...