Interesting floor process Stu. It gives me some ideas, so, a couple of questions:
1) Is the "moisture absorber" a clay product (ie. kitty litter, or oilsorb) ?
2) Did you space the joists to fit the insulation and does it just friction-fit in place?
Looks great. It would be fun to steal some of your Tokyo methods and apply them to an old NS farmhouse!