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Scott, I kinda hate to say it, but I think the last part is spot on. I think you'd have had an easier time if you hired out the seatwall and installed the patio yourself.
Here are the things you need to consider, given your current situation:
If your seat wall is going right next to your patio, you're likely going to need to pull up the last 18" or so of patio, reprep and relay it later, because the excavation you're going to do for the wall will undermine that patio base. So plan on some re-work there. Building the seatwall first would have been preferable if this wall is going right up to the patio.
Re: the blocks - if it's a curve, plan on cutting every single one. You may not need to, but you should plan on it. Even if you design it to follow the exact radius the block are designed to run in, you'll never hit that radius exactly, and you'll end up cutting lots and lots of block. So just resign yourself to cutting lots of block. And plan on renting a big saw to do it.
Almost all SRWs these days, when built as a freestanding wall, use adhesive as the material that bonds them together (some may use pins). Your local supplier will be able to suggest a brand to you.
If you're using Pisa 2, you only have one size to choose from, so block size isn't an issue. But I prefer block styles that allow for different sizes. Looks more natural.
You'll need 3 split sides to handle the ends of the seat wall,unless you run them into piers or columns made from the same material. So order them if possible or fabricate them yourself on site.
Depth of digging - plan on burying at least one full block, plus the depth of the base prep, which should be at least 6".
Contact your local supplier to get your exact quantities. They'll help with that. They can also provide product literature to help you in the construction.
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