I don't have a cut out plan or list, but I think if you cut the 9 9/16 or heigth you want deep body down the long side you should have enough for 1 box plus 1 side. The cut the rest from the short side, should get 1 long side and 1 short side of box per cut. You should get 9 cuts or 4 1/2 boxes plus the 1 1/4 cut down long side for 5 3/4 boxes total,if I figured right.
OK this is not a good drawing but maybe it will help.
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------8ft-------
l l l l l l l l l l
l l l l l l l l l l4 ft
l l l l l l l l l l
Joe