We have a passive solar house with an insulated concrete slab. So we just adapted the idea to the GH floor. Don't know how much solar gain it will give us till we put in benches and all but every little bit helps. You can see the pipe in one of the pics that is the conduit for the electric line when we are ready to tun power out to the GH. RIc has done a great job planing it. I will post more pics and probably put together a thread on the whole project.
