I really need help. (Hopefully with a Herbie style drain)

[rocketlily]

I think I can go with a Herbie style drain. Just to recap, I have a 2 3/4" hole (1 1/2" bulkhead) for my main drain and 2 - 1 3/4" holes (1 " bulkheads) holes that we to be used for return pumps. All holes are on the bottom of the tank. I tested a 1" drain and it can keep up with 2 Quietone pumps being pumped directly (no elbows, no plumbing joints) into the overflow. I would like to use the 1 1/2" for the main drain and one of the 1" for an emergency drain, leaving a 1" for the return.

Now my questions,
1. Can a 1 1/2" bulkhead be used for a drain for a Herbie style drain?
2. Does anyone have a link to a reference site with drawings that I can follow to install this?
3. Can someone with Solidworks draw a picture with measurements and directions that I can follow?

Thanks again everyone for all your help.