Water-jet cut delta?

I would like to build a delta reprap, fabricating as many of the components myself as possible. I was wondering if anyone could point me in the right direction/engage in spirited debate about what designs and materials will work best for my goals. My goals:

1) I would like to build as much of the machine myself as possible. I will have access to a 5-axis water-jet, but not a 3d printer, so I would like to utilize it as much as I can.
2) I would like to utilize PVC Sheet as my primary build material, in 3/4" thick 48"x96" sheets if possible (it's what I will have commonly available)
3) I also work next to a metal recycling center, so I can get scrap aluminum sheet material, etc. for use in the build
4) I would like to keep the cost of purchased components as low as possible (I think that's the universal build goal :) )
Secondary Goals:
5) I would like to be able to print with spools of PVC. They come in at about $75 for 50lb spools, and I have them readily available. I saw this Improved Extruder on Kickstarter and it gave me the idea.
6) I would like to be able to cut the parts for at least two from a single 48"x96" sheet of PVC

I like most of the delta designs, but the one that really caught my eye in respect to using the heavier gauge filaments was The Quantum Delta because I thought in a larger size it might allow for multiple print heads and allow for larger filament in a way that the Bowden Extruder and moving print head used in a lot of deltas wouldn't.

Thank you for helping me out, my sons want to build a 3d printer, so I am hoping with everyone's help I can make it happen.