Your Zytocactus pattern is available on etsy, here:
https://www.ebay.com/itm/304775074694
This pattern looks like your picture, but with 36 blocks - not the 32 block quilt you described...
Can't tell if it is exactly what you already have (fabric requirements withou.t instructions) or not though.
If yours is the same, it looks pretty straight forward...just rows of squares and half square triangles. Make 8 rows of 4 tulips instead of 9 to get 32 blocks. It looks like a 9x9 squares grid, with a sashing on 2 sides of the block that is half the size of the other squares.
Haven't done the math yet...
If each square in the grid represents 1inch, and the block finishes at 9.5 inches, then add your 1/4 inch seam allowance to each square, times 4 per row, times 8 rows, plus border width...