Sorry, no updates for a while!
As i mentioned above, no action from Thurs Aug 13 to Sun Aug 16. Then we were on a short summer vacation to the NY Finger Lakes area and returned on Wed Aug 19. When we returned they had installed the water fountains. Got an email from the main contractor that they werent working properly as my cartridge filters were very dirty so the pressure wasnt right, which is still a continuing issue as they are so hard to clean thoroughly.
No action Thurs or Friday, waiting for top cap stones to come in (supplier sent wrong stone). It's been one delay after another, waiting for things to come in. I don't know why everything wasnt ordered weeks ago? I guess that ties up cash flow? On the weekend we tidied up the patio as there was still stuff all over the place that couldve been removed weeks ago, so the patio is now usable again.
After vacuuming up all the dirt and gravel in the pool on saturday, so we could use it last weekend, my filter went up to 30psi and the water flow stopped. After cleaning, the pressure was about 25 but kept climbing. I hosed them 4 times with the jet nozzle, but even then when i open the pleats there is still tons of debris. Will need to keep working on that. But then when i switch the jandy 3-way valve to the waterfalls it drops to 13? Still diagnosing and investigating the pressure problems.
No action Thurs or Friday, waiting for top cap stones to come in (supplier sent wrong stone). It's been one delay after another, waiting for things to come in. I don't know why everything wasnt ordered weeks ago? I guess that ties up cash flow? Anyway, sub was supposed to come Saturday to install top cap but his truck broke down so no action. Monday they had to start a dig for a new pool elsewhere so sub arrived on Tuesday (yesterday). Came home at lunch to check progress, it wasnt what we were expecting, we thought it would be long slabs, but it is 2 foot pieces laid sideways from from to back. I called contractor and she said those are the stones in the catalogue, and the longest ones, which was true. Somehow we have never discussed what the top cap would actually be comprised of. I had an idea of laying them lengthwise so the 2 foot long sides are along the front, but the areas with the waterfalls will not support the stones laid like that, only from front to back.
The contractor is seeing what other options are available. If nothing we'll have to go with those stones, the sub said he will get his mason to grout between them. Currently they are sitting in place, not glued down, also there's a bit of a hump that needs to be grinded down. Also yesterday they laid 3 remaining patio stones that hadnt been installed yet, and ran the wires for the LED lights to the shed. Remaining now: install the transformer and LED controller, sand in some polymeric sand in the patio, cut in coping stones between the wall and the coping, and complete the top cap.

Wall with waterfalls installed.

Top view of waterfalls.

Closeup of front of waterfalls.

The falls in action! (finally!)

The wall with the top cap in place.