It occurs to me that the simplest method would be to do the making of the basic sheet from this youtube:
And then emboss it by making an embosser by gluing a commercially available plastic foundation to a piece of plywood and then the other side to another piece of plywood. So you would have to purchase two plastic foundations.
Then make some sort of jig that allows them to mate properly and then putting the sheet on top of one then placing the top or other side press to top and applying pressure.
This is just theory to me now.