I got your picture and video; see below.
What I would do is go to a local sheet metal shop that specializes in SS restaurant counters and sinks, and have them cut and punch 2 strips of 14 or 16 gauge 316 grade stainless, about 1.25" wide, corresponding to the 2 lines I added to your photo. I'd also have them fabricate (3) J-hook clips that I could mount to the edges, and to the large rock in the center, and then slide the rear strip into. You'd probably need to make mounts points of 5/16" SS all-thread, epoxied into DEEP 3/8" holes, and attached with SS cap nuts.
You could make the bag out of this material: http://www.onlinefabricstore.net/4mm...esh-white-.htm
I'd assemble it with white stitched velcro to make it remove-able.
. . . but it would be expensive to hire it done. The shop I use locally won't make anything unless I give them a drawing. The strips + the J-hooks would probably cost $100. Getting the SS all thread and cap nuts would take a couple of hours, unless I could find it online. And drilling those holes without damaging anything would take new bits and a lot of care.
If you don't have the skills to put it together yourself, be careful. This would NOT be standard pool work: not many pool guys could do that for you; it combines too many odd skills.
Good luck!
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