The h4 is 1/2 the length between the tip of the main beam and the non present g3 so you use that # twice. I guess my gross score is 57-4/8 then. If this looks correct Ill submit it, and I added the main beam lengths.
RMB: 11-2/8 - LMB:10-5/8
INSIDE SPREAD: 9-1/8
RIGHT ---------- LEFT
g1: 1-5/8 ------- 1-2/8
g2: 2-7/8 ------- 3
h1 2-5/8 ------- 3
h2 2-3/8 ------- 2-4/8
h3 2 ------ 1-5/8
h4 2 ------ 1-5/8