Received MS20257P3 piano hinges from Aircraft Spruce. I'm afraif that AS's S&H will bemurder over the life of the project, particularly without a complete drawing set to determine how excessive the Xenos-A hardware kit from Wicks for the B-model Quick Build kit.
Cut to length (46-1/2").
Setup clamps on drill press to space #40 holes 1/4" from edge of leaf.