OK, it's for Warmaster but the main thing i wanted to present is the general idea of a table with such material.
Remember those matt you've played with when you where kids (or your children). Yeah, the thing with bisphenol A, etc...
It's a long time now i wanted to use them to try to build a wargame table. I had even started some first parts and began a 40K/Epic one. I will transform them to play warmaster on them.
Interest :
- It's supple, so absolutely not fragile.
- Lightweight.
- You can dig reliefs inside.
- Modulable like a puzzle.
Here. I had those four parts sanded with wood glue.

And i will change them to have a river.

In 2 hours yesterday, i have stared to use this tool to dig the foam.

Not an important thickness, but it should be sufficient to give an impression of small deapness.

I have manage to find a good way to dig the foam by stripping small bands. Don't try to do moret han that or your tool will bite in the foam and either be blocked or dig a too big hole.

And here is the proto-river. It's a small river, with a slow debit, so it makes curves. It justifies the slightly inclined edges.

Then, i changed my tool for a metalic but vertical brush, to erase the marks of the stripping in bands.
You can see it's a little bit flatter on the beginning of the puzzle.

Marks remains a little but it's better like that.

Here we are when it's done.

Second part. I had crevasses with lava, and i needed to cancel them.

Wood glue was hard to remove, so i have worked again with my first tool, but holding my drill verticaly. And this cutter blade for too ig parts.

This part will have a ford, where the rivers slows. It's because it meets a hill, that breaks its speed, forcing it to curve.

The river arrives by the right, is blocked by the small cliff, and then the stream is slowed and the river even makes a small island in the middle.

Here i have pierced my foam mat... It had to arrive at least once.

Digging is done... I manage to keep the river on one side of the foam square. So if we don't want to play with it, it will be easy to manage to keep it apart, on the edge of the playing zone..

Here, there will be a small elevation. Not considered as a hill, but i wanted to have small reliefs. I'm bored with absolutely flat tables. I want to see realistic hollows and bumps.

First study for the last one. A more urbanised zone, where the river is forced straight by a canal with small docks, etc.

Andi had at first thought of bassins, or someting like that, after what the river return to its natural flow.

I began to dig but was not satisfied so i stopped to think of it again. I like the bassin idea but it alsao remove playing surface. And a just straight river in the middle of nowhere did not convinced me.
Andi told me that docks frequently meanet sea. And that a sea corner could be great. It's maybe not completly definitive but i like it better like that. With sea on the corner, and a beach where it's storked.

After that, i have added in the bottom of my river Sika glue. I don't want to make any advertisement, but you can paint it and it does not retract while drying. It's not the case of many other products like that.
I manage to spread everything with my fingers, what was a bad idea because it only clean with white spirit. And i hate putting some on my hands because it smells. Maybe an oiled tool or even a potatoe or something for next try.

First river is done. Foam is still visible for i manage to put as few silicon as possible. With a second layer, it should be flat.

Here is the second part.

I will put some all over the edges of the puzzle parts. It should not be removed easily, while the melange wood glue+ sand crackles.
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