We have completed assembly of the first Beam Splitter Lower Structure. No fit, machining, or alignment issues were noted. The main Lower Structure drawing (D080005) calls for eight 1/4-20x0.5 SHCS. However, the EQ Stop Plate (D080008) and the LS-US Bracket (D080011), both require 1/4-20x.05 SHCS and therefore 16 of the 0.5” bolts are required.