Subfloor supports going in

Thank goodness I have a pair of knee pads that are perfect for the van conversion work. Enough foam to cushion my knees (both of them have torn cartilage...) but the outside is soft enough also to not dent or scratch anything. The wood ribs (1/2" Auracoplywood from Homedepot) is perfect for bring up the spaces between the floor ribs. I've also but a layer of aluminum and foam duct insulation onto the ribs in preparation for a 3/8" baltic birch plywood as a subfloor. The slats and then the plywood subfloor are all being secured with Sikaflex 221. Then the top sheet will be bolted from the top using long "L" brackets and the bolt holes that are normally used for the D-rings in the cargo van. I also managed to get lots of Thinsulate insulation installed/glued as well.