Hmmm... you can check out Team Aquascape on YouTube. They build them all the time.
@GBBUDD built one - I think he has pictures in his pond build thread here:
This is where you say be careful what you ask for the storm has turned into a nor'Easter
www.gardenpondforum.com
It's a long thread, but I think he has pictures and a good description of how he did it. I think his is slightly different than ours.
Ours is an edge (essentially a waterfall, so we just had to be careful to place the rock at the outflow just slightly lower than the rest of the pond edge to keep the water high enough but not too high, if you get my drift! ) that flows into a 1000 gallon underground water catchment. It's filled with Aquablox and some cobbles and topped with river rock. Add a centipede and snorkel and you have a pump housing, too. One of our better ideas in pond construction. No skimmer needed!