Glenn, great build so far! Wish I had seen this sooner, I would have chimed in on the return. I think I am becoming the "Herbie" advocate on these boards. Coming from many years of durso stands, do yourself a favor and do a Herbie..... You will thank me and yourself later. No noise, easy to dial in and the absolute most important part....NO BUBBLES. It creates a true siphon and you will not get the "gurgle or splash" synonymous with other overflow types, like dursos, which leads to the dreaded salt spray and eventual deterioration and rusting of everything within range of your sump. If you can implement it, do it.
Wish I didn't spend all my money on booze and women....