Hey Paul, check out a place called ecooutdoors.com.au for inspiration. I'm not sure if they're up your way but I'm sure you could get materials shipped. They have such a beautiful store with brilliant ideas. I'd be considering a stone that is cool under foot on hot Brisbane days and at least 30mm thick. You have an oval-ish shaped pool so you might consider a small coping stone to replace the brick then move on to a larger stone instead of the dated pebble, maybe a 'cush' limestone or go a bit glam and do a herringbone pattern with the right stone. Good Luck.

Sorry but the water line blue and white flowery tiles look old fashioned and if you're going for that kind of sandstone on the top it won't go with the terracotta tiles you have already Do like the pool and tiles that Hayda Natural Stone have posted Very nice!

horizontal anything is a no, the gap would have to be so small it might as well be solid. yes the vertical cable might pass but you are not allowed to be able to squeeze them together as then the gap distance is non complying, The safest one is the solid section PCA pool fence, or glass, or solid, to 1200 mm in Queensland, no greater than 100 mm off ground, and gaps not able to be manipulated, and to stop that you have to have horizontal section in the cable type, which then do not comply, cut metal screens if complying is OK. I would question the void, and if you know the reason for the void, than solutions will be able to be worked out, now we are asking why? Pools in adjoining yards are acceptable with pool fencing complying on both sides, no void is required. so the void sound a bit iffy, unless it is something to do with storm water, or a building requirement, so ask the question why. Pool fencing can be awesome.

We built a pool exactly the same, however we didnt use laminated glass but a monolithic piece of 80mm thick Plexiglass 3mx2m from Germany. This reduced the overall cost of the pool considerably. Pool was fantastic and doubled as a water feature when not in use. Incorporating LED lighting allowed the pool to take on the mood of the night. The only downside we found with the pool was that after heaving swimming and sunscreen the waterline of the Plexiglass would need a clean. Other than that it gained lots of comments and was even used for photo shoots and promo work.