They will have to sit on the edge of the spa and swing their legs over the edge. They do have a step inside the spa which I am guessing will not be used as a step. It will be used as a seat more than anything. The moat around the spa is part of the shelf so they can swing their legs over and walk to the step on the shelf. They do not want to block the flow of water around the spa.
I’ve kind of obsessed on tile. I think I’ve found the most help on instagram. I will find a manufacture I like and look through their posts, then I will click on the designers they tag in photos, then I will click on the photos that others have posted that tagged the company. It’s like a rabbit hole, I can get lost for hours just looking through all of it. A very popular company for bling tile and other glass options is Oceanside Glass and they are out of Carlsbad. Their popularity is increasing, I’ve seen a ton of huge landscape designers using them in all their newer projects. Here is their link:
since youre local, I’m sure you can go to their showroom and check them out. I believe they manufacture them in house so you can even ask for a tour. I’ve had so much fun touring tile and paver companies and watching the process.