3 important things to consider when designing a huge tank size- water change, coral placement and equipment specs.
Water chg- using ro/di or nsw. Make sure it's seamless and hassle free.
Coral placement - tall tanks are nice but make coral placement difficult and need stronger lights for deeper light penetration. Recommend Max ht : 2 ft.
Right specs for impt equipment to support yr livestocks such as chiller, skimmer, lights, return pump. Ca reactor is more efficient as compared to dosing for such a big tank.
Do talk to a few tank makers and reefers when designing yr tank and don't rush.
Have fun designing yr tank. This is the most fun part