Welcome to the sps reefing family
Have got just two ideas for your consideration.
Lightings - See that your lightings are quite aggressive with 4 MHs. Nothing wrong but just try to cater for a design which you can switch between MH and T5s just in case you decided to give T5 a try. Btw, you might wanna consider placing the blowing fan at the level in between the MH and the water level, this will ensure the heat generated by MH is directly blown towards the exhaust fan = better heat extration.
Sump - Try to cater a refugium section, in case you wanna keep some macro algea for nutrient export. There will be advantage with some critters like pods and so on to thrive there which is good for your corals including sps.
I find bro Lemon Lemon's sum tank is quite cool, check out his design
Happy planning !