Especially considering how easy they were to make, and how well they appear to work.
I made my boarding straps from 1" nylon webbing. The same stuff that cargo tie-down straps use. I have a big bag full of tie-down straps, way more than I ever need, so I recycled two of them.
After doing some research, I found that 20" below the waterline is where they work best. I formed the webbing into a big loop, ran the ends through two holes that I have in bulkheads 5 and 6, and tied the ends together. That's all there was to it.
I like the bright yellow color of the webbing. I think it will be easy to see under water and in an emergency. I will simply bunch the webbing under the side deck. In the event of a capsize, the webbing will spill out onto the seat tops and should be easy to find.
I added one on each side of the boat. I tested them in my driveway and was very pleased with how they worked. It was much easier to get on board the boat than I thought, after only one attempt. Here's a video. Try not to laugh. This is serious business.
I will do an on-the-water test, but I already feel relieved.