Glad that you are back in the midst of a new pool. The design is nice. I have a waterfall and really enjoy it.
This is my views:
Appears there is only 1 skimmer. I would get 2 at opposite ends because wind has a lot to do with where surface debris floats to even more so then the circulation within the pool. Have each skimmer independently run back to the equipment pad.
Its shows a 2hp VS Pump for pool circulation which is good
The second pump is a 1.5hp SuperFlo. I assume this is for the waterfall. Ensure you have separate circulation path for the waterfall. Mine has suction on wall (looks like bottom drain covers), directly to a pump then return to the waterfall. It will not go through the filter. Also, it is all with 2inch PVC suction and return lines. It should be controlled completely independent of the main pool/spa circulation. Ensure the PB has designed the waterfall to meet your expectations.
The 3rd pump is a booster pump to drive your pressure side Polaris 280 cleaner. I would drop this altogether and just go with a robot - need to set up a GFCI outlet within code near pool. This saves you maintenance of a pump and an old technology cleaner.
Ensure that you have control of spillover from spa to pool. Such that you can turn it on or off. Also, ensure the PB sets up the VS pump properly to provide the spillover effect to meet your expectations.
Definitely try to go to using a SWCG.
As a minimum you want 3-4ft width of decking next to the pool. You do not want people, kids, running in the grass then jumping in the pool. Also, if you feel there could be drainage issues, then have drains built in under the decking to move water away.
Your equipment pad looks to be in an isolated part of yard. Not sure what trees or shade you have but best not to have your equipment exposed to sun all day long. If there is no natural shade, consider a semi-enclosure with a roof over the pad. Also have a light on it as well.
Autofill, heater and filter are all good. Get the physical part number for the Easy Touch with Screen Logic as there is a "light" version that most will say to steer away from.