James,
if you follow the panel dimensions from the
Wood Magazine project (pg. 60), you can get 8 panels (2 shades) from what I believe to be a standard sheet size (18" x 36")
The dimensions I show in the blog #7 are for this. with some slight changes in dimensions to account for the extended spokes.
For my floor lamp I scaled the shade up 15% which would almost give you two shades per sheet, but not quite. Luckily I had enough extra to get the last panel for the two floor lamps I've made.