I use bottom drains and skimmers. Your flow chart looks similar to mine, I don't use settling bins. Might be useful, but really hard to clean out, seems like in no time they'd be full of crap. Literally.
You have your jet bypassing your filter. Might be the right way to get pressure, just have to know what filter, pump, etc. you are using. Personally, I don't like submersibles, but that's me.
Definitely be able to isolate your bottom drain and skimmer with valves for each. I hate ball valves on the supply plumbing, too hard to turn and restrictive. Gate valves are much easier, and you can cut some 3/4" PVC to make keepers so they can't close accidentally. If you need me to, I can post a picture.
Check valve before your pump should be good, I'd suggest an external with leaf basket/priming pot.
Good luck, ask if you're not clear on any of this.