with the end pours we used epoxy thickened with microballons and we started with about a three to one mix. The mix was still a bit runny at 3:1 so we added a bit more microballoon till the mix was about the consistency of toothpaste
I dont know what the extra did for the structural integrity, but the hardened mix was still solid enough to screw into and fix the stainless steel saddle you see in the photos above.
With the deck we temporarily strapped the plywood down on the boat for a few days before we applied any epoxy. This gave the ply a curve and seemed to make our job easier when we did the permanent fix with the epoxy.