The wall
First we contacted some XPS manufacturers to know if they would be willing to make smaller batches. We were told "no".
Then we contacted them about different height products. Some that would be easier to fit into the 1-2-3 inch heights. We were told "no".
Then we researched how to make our own XPS foam. Realized we would need a massive amount of capital, asked our wallets and were told "no".
The solution
If we couldn't get the materials in the sizes we needed, we would build a thing to get them in the sizes we needed.
So onwards with electrical engineering and bandages!
OUR XPS