Ok...the mats are sold at Farm supply stores or feed stores. I pay $39.95 apiece here in Clovis.
This is looking towards the leopard shed. I had to piece out the doorway section because I didn't have a big enough piece of the mat to do the whole thing with no seams:
And now I'm inside the shed looking back at the doorway, and I've lifted up the edge so you can see the thickness of the mat. Remember, they come in 4'x6' size, and this is a piece I had left-over to fit in the doorway. It looks like substrate underneath, but its really just dirt/ground up poop that worked its way under the section. It's really plywood underneath:
This is looking towards the leopard shed. I had to piece out the doorway section because I didn't have a big enough piece of the mat to do the whole thing with no seams:
And now I'm inside the shed looking back at the doorway, and I've lifted up the edge so you can see the thickness of the mat. Remember, they come in 4'x6' size, and this is a piece I had left-over to fit in the doorway. It looks like substrate underneath, but its really just dirt/ground up poop that worked its way under the section. It's really plywood underneath: