Mechanical fastening update . . .
There are a total of 26 bolts which will hold the swim platform to the boat, along with the adhesive.
I got 18 of them done today, so 8 more to go.
Here are a couple of pictures of the underside where all the support hardware resides.
Here are the 8 fastening bolts for the 4 main struts that will support the platform. Also the side strap in the distance.
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Here are the struts fastened to the platform.
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I had to offset them from the platform with the white spacers you see, because the studs were not 100% threaded and needed a standoff. There will be 8 (or maybe 12) mating bolts on the underside to the boats swim deck/transom area. I need to make some similar spacers, but they vary in thickness from 11/16" to 7/8". I might try to find some 1" thick synthetic trim board and use my planer to fine tune them.
Getting the bolts in there is going to be tricky. I may decide to cut a deck plate for access and then to seal it up.