I took the number of strips you would need for each part of the block and multiplied it by the number of blocks. Then figured that if your width of fabric is 40", how much you would need in length to cut the strips.
So, say you have to get 20 pieces of fabric that are 11/2 X 5, you times that and get one strip at 40" wide will give you 8 pieces and two will give you 16' so three will give you more than the 20 ( you will get 24 ), so three strips cut at 11/2 inches, is 41/2 inches by 40 inches (WOF ). Of course you can't actually get it out of 41/2 inches because of your cutting, so I add an inch or so for that. It ends up being more like 51/2 or 6 X 40.
You do that for each part and then add it up for each fabric. Since you know a yard is 36 x 40 you can figure it out. I haven't gone back and rechecked the numbers from last night, so you might want to do that before you buy any fabric.