I'm new here, but wanted to add formufit to the list of links on your cork board. They are solely sellers of structural PVC items, used to build greenhouses and such. I am currently building some outdoor PVC furniture as the weather here in Missouri has destroyed our previous 'durable store bought' furniture. I saw some other resources on here, but I just bought a slew of products from formufit.com and I thought I would share. I will post some photos of the completed furniture soon.