Tubes are In!
The radiant tubes weren't actually that hard to put in. We left them out in the sun for a while, and stretched them completely out straight to take the kinks from the packaging, and then just pulled them in and laid them out.
You can see we simply used slats of wood and screwed directly into the mud sub floor, squeezing the tube a bit to hold it in place. we'll pull those out as we cover it with clay.