Ok, so here are my measurements...
Triangles are Right Angled with one 11" on two sides with the long edge 15 5/8", the second is 15" on two sides with the long edge being 21 1/8". On one side of the diamond on half of the diamonds I need to use the long edge of the 11" triangles on the biased edge of the diamond which averages 15 1/4", half on the straight of grain edge which averages 14 3/4". On the big triangles I'm to use the 15" edge of the triangle on half on the right side, which again is averaged at 15 1/4" and on the other half on the left, again measuring on average 14 3/4". So I'm thinking half of the small triangles will work on the left side, half of the large will work on the right side and four of each need an inch or so added to them to make them work at all.