I have been making this play board recently for my games of D&D, its made from 12 mm MDF which carved into to create the stone flag effects and added sand and grit too for a bit of textural variety.
The cutting went reasonably easily to be honest I thought the whole thing would lose strength but no, it was fine especially after I had undercoated and then painted it.
I did a final coat of PVA to give it strength and to seal the grit in too.
How it looks with the wall and door sections I have made added.
Now with some furniture, all hand made a few years ago.
I am in the process of creating a second 1 ft by 2 ft board of the same type, will post when complete.