OK, here is how I set up my studio.
Instructions for building the diffusion panels can be found here:
How to build a diffusion panel
I would recommend reading through the other stuff at the site.
The dimensions I used were slightly smaller. Each PVC pipe is slightly less than 20 feet long, so can be cut up nicely into 6 feet x 3 feet panels. The PVC pipes can be bought at any industrial estate. I went to the one at Lavender Street.
The cloth materials are from Spotlight. You only need about 2 metres of each. I stitched a hem around three edges and threaded the PVC pipes through them. They were fastened with zip ties (you know, those plastic tying things you can tighten simply by pulling - very cheap one whole bag from Sim Lim Tower can last you many years).