Nick, quick suggestion - do you have to secure the walls to the floor this weekend? Could you build them and temporarily anchor them by other means until the concrete is cured before you secure them permanently? When I refinished my basement I had a couple of walls that were a fairly snug fit between the subfloor below and floor joists overhead that easily held them in place with no anchoring. I of course did anchor them before finishing but they were solid enough for any other work that needed to be done before the drywall went up.
