Hi Cesar … sorry I didn't see your post earlier (I was just checking back on my recent post and notice your question.
The terrain is expanded polysterene (insulation board) built inside what we call in the UK a pasting table (a lightweight frame type table built for putting the paste on wall paper*). They are cheap and, with the legs removed, it is essentially a shallow folding box.
Essentially I switch the hinges around to it opens out 4x3 rather than 2x6, and fill the interior with landscape made of polystyrene sheet.
It's a battlefield in a box (many people have taken the idea up subsequently) …
I first developed the idea for a travelling Naseby battlefield display.
Here is the Naseby terrain being painted with earthy matchpots …
There is a little teddybear fur and some flock but mostly the surface is just the polystyrene mottled and brushed with household paint (matchpots) I think 'prairie gold', 'chocolate' and a 'parchment' dry-brush.
I just painted and stippled and mottled til it looked OK the stopped (it looked surprisingly good) …
I doubt the materials including the table cost over £20.00 GBP, so I think it a good investment.
I have half a dozen or so of these representing different historical battles.
This one is fairly generic, of course so with some extra pieces added on will do a number of Middle-Eastern open battles**
Thanks for the positive comments, Cesar
Phil
Ancients on the Move
*the UK is a nation of DIY enthusiasts.
**I may well use it for the battle of Pharsalus to come.