Tube layer of floor starting to go in

Starting in the little back corners and using a perlite mix (perlite is a natural lava rock found in California that is super light like styrafoam... it's those white dots in your potting soil) and putting it on areas that *don't* have tubes, as sort of a insulated 'stay cool' area.

Under the future toilet buckets:

and under the kitchen counters:

Those 2x4s getting mudded in will be anchor points for the posts holding up the counters.