Got full equipment list as well as better drawing showing returns/piping/overflow location.
Great. I see the returns, the overflow, the vac connection and the autofill line. The only thing I do not see is the skimmer location. You want to ensure that the returns are pushing some flow to the skimmer. Also, I still recommend 2 skimmers. One in deep end and other in shallow end. Although you have a screen enclosure, so the debris factor is minimal. Just a thought for your consideration.
What filter to change to? ( Only I see with DE is filtering the smallest particle levels especially with sunscreen/lotions and potions being so prevalent here in Florida but if that's not a good enough benefit wondering which jandy cartridge model to sub in)
DE filters are good as you stated. The issue is monthly backwashing and handling of DE powder. I have one and happy with it but will give strong consideration to a large cartridge filter should I need to replace it one day. If you decide to go with a cartridge filter, then select one that is over 200sqft. Jandy makes a 340 series (340 sq ft) which would work well.
Automation seems like PS4 = Pool + Spa when we have pool only?
Agree - PS is pool & spa. Also, suggest it should be at least a P6 or even a P8. This gives more flexibility as to what you can connect to the relays (4, 6 or 8) You may not need all right now but need flexibility for future.
I am confused because it clearly states PDA version which is local remote only. It is a handheld device that talks to the automation box. However it also states iAquaLink which to me indicates it is the web (and app) version. That is called RS4, 6 or 8. The RS provides remote access via internet. It is feasible to have both PDA and RS but it requires 2 antennas. One is for local remote access via the PDA and the other antenna is for remote access via internet. The RS PCB allows both to be connected. You would do all your programming via the internet access and use the PDA for control of non-scheduled events. Suggest you seek clarification and request the part number for the 2 line items they have provided for the PDA and iAquaLink
Other feedback
The VAC line is for a suction side cleaner. I do not see that listed unless you plan to purchase separately.
The Jandy ePump and AP1400 SWCG are good.
I do not see a heater. You may not want or if you wish to consider it in the future, then ensure the equipment pad is large enough to accommodate it. this avoids pouring another pad in the future.
There is a calculation regarding turnover. That is somewhat of a myth. Also, since you have a Variable Speed Pump you will not be running at full speed (60 gpm or higher) all the time. The beauty of a VS pump is to run it at lower speeds to gain the energy efficiency and still produce chlorine via the SWCG and create circulation for the skimmer. I run mine 21 hrs a day and for 18 hrs of that it is at 1500 rpm (less than 30 gpm) to create chlorine and 3 hrs at 2400rpm (50gpm) for skimming. (Actual flowrates at RPMs vary based on plumbing design). Hope this helps.