The instructions as given are for a block that is an 8x8 grid, with each unit a 2.5" FINISHED square.
So you want to resize that keeping the same 8x8 with each unit a 1.25" FINISHED square.
There are NO triangles involved.
These are the CUTTING sizes required:
Blue green - Twenty 1.75" squares
Gold - One 3" square
Gold - Four 1.75 x 3" rectangles
Gold - Eight 1.75" squares
Black - Twelve 1.75" squares
Black - Eight 1.75" x 4.25" rectangles (long)
Black - Four 1.75 x 3" rectangles
This should create a block that is 10" (plus .5" seam allowance) square.
I double checked it - I hope I don't have a typo in there.