I just ordered a glass drill bit and I will be configuring my sump with a 1 inch bulkhead for an external Genx 70hp. Thus I will have my OceanRunner 3500 internal/external pump, check valve, ball valve, flexible tubing, SCWD, 600 gph overflow, and a 45 mm bit with one hole under its belt. The OceanRunner is rated at 900 gph. However, after you figure out all the elbows, checkvalve,ball valve, head height, SCWD etc... It never did overflow my 600gph overflow. It pushed it but matched well.
I ordered my bit from ebay and some locline for my new eductors from salty critter this week. I'll more than likely complete my project in the next few weeks if you care to wait for the above equipment. I normally sell stuff for 40% to 60% of new cost. I take care of my stuff.