Tuzz: I have had plenty of time to obsess about what I will be doing. Too much time actually. I have built several PVC trees, 30 gallon poly drum stucture and landscape piping structure to put in. I posted some of them here

I also hired an Amish deckbuilder to put in a dock before the pond fills up. He'll be using 6x6's for the supports.

While I do like the idea of plastic structure I also want to include rocks/boulders similar to your pond.