PVC

CAD File Sources

• Schedule 40 DWV Drain waste Vent + Many Others- [1]

PVC Pipe Dimensions

• Schedule 40 and 80 - [2]

Formufit System

• PVC corner construction set - PVC 101

• How-To Manuals - PVC Field Manuals freely sourced by FORMUFIT for cutting, cleaning, assembling, bending, sizing.
• Plans and Design Ideas - http://www.formufit.com/free-pvc-projects-plans/

Notes

...of note, this company will offer store credit for creations submitted to their free online library. In addition, they have Sketchup creations that could be of use to your Factor e Farm. Perhaps an informal partnership with OSE could help you source much needed materials?