Mark: Ya, I'm keeping that in my mind, but I'm going to have to get it in front of me before I can actually figure it out. I'm worried that my whole sump will only be able to be 1/2 full. If that's the case, I'll make my own sump from scratch making it extra tall so that it can still hold a decent amount of water.
fkshiu: I thought of that about the pump...I have since decided to move it to sit in front of the sump. I will drill the sump, and feed the pump with a bulkhead.
I did think about tee-ing the overflow or return water for the fuge, but I don't want to screw around with a string of ball/gate valves. I think it just may be easier to use a MJ1200 which I have several of anyway.
I think I should probably add a ball/gate valve on the return line before the check valve...? I think a ball valve should do on that side. I can't imagine needing to dial down the pump though, but I won't know until it's up and running.