Nick,
Just curious - I notice the base plates for the walls are green pressure treated instead of regular lumber. Is that the building code for your area? Where I am we either put regular base plates on top of the sub floor or if going directly on concrete we vapour barrier underneath the bottom plate. The PT idea makes a lot of sense though, even with vapour barrier I'd think.

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1