Hi Loretta. Your panel will not lend itself to full 5" or 6" blocks evenly. If you take out the seam allowances a 5" block finishes 4.5". The 32 3/4 side would need 7 whole blocks plus 1 block that is 1 1/4 wide. After you add that your 47 1/2 sides are now 57" long. To cover that you need 12 full blocks plus one that's 3" wide. Double check my I math but I think this will border your panel.
Darren