Open concept allows you to have free play on yr sump design. However, in yr planning, u should consider the following:
1. Any mechanical filtering? Basket or filter socks, etc
2. Micro bubbles issue?
3. Space planing for equipment(in-sump or out-sump)pumps, reactor(FR & CR), UV, skimmer, drop-in coil, etc and setup(bio filter like biohome, bio ball, algae scrubber, refugium, rocks, quarantine compartment, etc)
4. Equipment maintenance space