Hi Candutch. Just a tip. Your use of Tee nuts reminded me of a bad experience I had that you can avoid. I used them inside an upholstered seat that was then secured in place. My experience was that if you don't apply a little bit of lubricant (maybe white grease) to the threads, when you insert stainless steel bolts into stainless steel tee nuts, they gall easily and can become hopelessly locked together. I had to tear apart upholstery that was well stapled and you don't want to be pulling up your decking. Also, I've had tee nuts lose their grip because I pushed a little too hard with the bolts before they were spun up tight. Royal pain. Verify the threads are good on all of them before final assembly.
- Grandad