I am usually stunned by how much PBs will charge to add this or that. Just be aware: If you buy three of a select list of Pentair equipment on the same invoice, they'll extend the warranty to 3 years. That 3-year bump applies to the rest of the Pentair gear you buy at the same time as well (there might be some exceptions, like lights, not sure). If you install the SWG yourself, that won't be included, and might even miss the one-year warranty criteria, so only 60 days. Be sure you understand Pentair's somewhat convoluted warranty policy as you strategize purchase costs vs DIY.
I think your pool looks amazing, especially the surrounding landscaping, if you can even get close to that look it will be awesome. Really stunning. That said, I can't help but think it was designed by someone that hasn't ever maintained a pool, or a garden! Others have already discussed the rock. I agree with what was said. Your pool has a deck walkway around only about 50%. Try to picture what it's going to be like to brush the sides and bottom of that pool, with all the obstacles: grotto, bridge, rock coping, etc. Brushing sucks for pools with the best access, that task will be pretty tough in your pool. Also picture how you're going to maintain the garden, especially the areas so close to the water: weeding, trimming, planting, etc. Splashing salt water onto those areas will also be an issue. Plant selection might solve for that. But good luck trying to get kids not to splash! Think those aspects through carefully.
The bridge, love/hate the bridge. Consider incorporating it into the garden somehow, not over the pool. Where to begin. I've seen a bridge or two I liked. One in particular spanned a lazy river that surrounded a spa. But that bridge did not span the primary entry to the pool. How are your adult guests supposed to navigate that? What is the water depth there? And "square footage" of that area. It's spanning what would otherwise be a major gathering area for folks, short or tall. And how much space is there between bottom of bridge and water level? Will adults have to stoop to get under it? But not too much or their face will be in the water? How many people can pass under at the same time? Single file? Are you expecting everyone to swim under it to get into your pool? Depending on air/water temp, sometimes I want to walk in slowly to acclimate, sometimes halfway across pool. In your pool, I couldn't do that, and I'd be stuck in what looks to be a very small area while others are clamoring past me? I think the dimensions of all that area of the pool are going to be critical to how well that all is going to work, both horizontal and vertical dimensions. Then there is the issue of kids jumping off the bridge into a shallow end? Not just from the deck of the bridge, but from its rails! Yikes. "If you build it, they will jump!" Water refracts light: you can't judge where something is underwater, it won't be where you think it is. Same from underwater, too. Someone surfacing near the bridge will not come up where they think they're going to. Head-clonking hazard? What about someone that's coming up fast and forgets about the bridge? Even if you think there is enough clearance for the bridge in the middle, what about where the bridge gets very close to the water. Love the bridge, just not over the water. Sorry... I know, contradict much?!
I do like the little "hiking adventure" aspect you have going, how you get to the back deck. Over the bridge and through the woods, rock path and all, etc. Very cool, romantic. Though not sure I like that you can get back there only over the bridge. OK, I beat you up enough. My over-arching concern: the pool design seems to be very visual-centric, and satisfies that in a spectacular way. But the design falls short, equally spectacularly, in terms of its real-world use and maintenance. Do try and imagine what all the various activities, including the chores, in and around your pool, will actually be like, not just how everything looks. And then decide if the trade offs that have been built into your design are going to be worth it.