The Maple Leaf block is based on a 9 patch, so it will easiest to make your blocks with the patches evenly divisible by 3...
So 1 1/2 inch patches will yield a block 4 1/2 inches
2 inch patches will yield a block 6 inches
2 1/2 inch patches = 7 1/2 block
3 inch patches = 9 inch block
etc.
so to make an 8 or 10 inch block will be difficult to cut.
At any rate, to figure the sizes to cut,
for the square patches add 1/2 inch to the finished size of the patches
for the 1/2 square triangles, add 7/8 inch to the finished size of the patches and cut a square, then cut in half on the diagonal.
Using the 9 inch block as an example:
The square pieces will be cut 3 1/2 inches
The triangles will be cut from a square 3 7/8 inches cut on the diagonal
If you still want to make an 8 inch block,
divide 8 by 3 and add 1/2 and 7/8 inches to the corresponding pieces.
Let me know if this needs more clarification....