Got some nice pics for you =)
Somebody's full diagram of some plumbing. Source
Something you might expect to see after you finish plumbing. The Source
has some nice pictures as well. you may be interested in reading it.
Back of a tank. You can see that the water comes down the pipes to the overflow, as well as being pushed out to create current. Look at the location of the holes. Placement can change the current throughout the tank. Source
Bulkhead that is attached on the hole drilled into the glass or acrylic. this allows you to use PVC
piping (or tubes, etc. ) to get the water to/from the sump. Source
Hope some of these pictures show you what the plumbing will be like... If you were close to where I live I could always help plumb it =) But i don't think you are if I remember correctly... But it isn't too hard, especially if you have some experience.
edit: Nope, you aren't close. Oh well. If you can't figure it out, I bet you could find somebody that can help. =) I bet you could get it. I mean, I'm having some trouble myself figuring out how I'm going to plumb my whole sump... D=