Nice pics, Bill. Your cleverness & ingenuity never cease to amaze me. I'm an avid follower of all of your posts.
Just some thoughts on mesh side water bottle pockets. I like 'em. They can be used for more than just water bottles.
However, my primary pack is a G5 which doesn't have side pockets designed for easy access to a water bottle.
If I'm not using a Platy bladder in my pack, but am using water bottles, here's what I do. It's a really low-tech, LW sol'n - no fabrication/sewing skills required.
On the G5 (which doesn't have the typical water bottle pockets) & even some packs with slanted mesh water bottle pockets, many people, including myself, can't reach the water bottles.
[NOTE: this, in my case, is due to limited mobility of the shoulder joints. often this is a genetic issue with short/tight capsular ligaments of that joint (nothing one can do if it's the ligaments that are "tight"). tight muscles, on the other hand, even if due to increased muscle tone from a lot of weight training, for instance, can be relaxed/stretched using PNF stretching techniques. just tryin' to anticipate a future poster's comments on "shoulder joint mobility" here. we now return to our regularly scheduled post...]
I bought some bulk 1/8" bungee & hook&loop (Velcro) fabric from REI. Oh...and also some mini-cord locks. Using either the bungee, or the hook&loop fabric, or both, "loops" are fashioned & merely looped around the shoulder straps (you can place them above or below the sternum strap - my G5 has the opt. sternum strap). They are a semi-permanent fixture now & are not removed each time the water bottle is accessed.
When carried below the sternum strap, the "loop(s)" which now are wrapped around the 1L Platy, or Nalgene water bottle slides to the very bottom of the shoulder strap - at approx waist belt height.
It's very easy to reach down, slide the water bottle & loop up the shoulder strap & unfasten the water bottle since it's now basically in front of me. Have a quick sip, refasten, let go of her, & let gravity go to work & slide the loop&bottle back down the strap.
Obviously, there isn't even any mesh to protect the water bottle. I hike mainly on trail, so this isn't an issue for me.