Because I'm a cad/cnc nerd, i did a quick model of the strong back and 2 piece gussets I'll cut out to keep the vertical stanchions plumb and rigid. A nest of 20 on the cnc will be a quick project.
Probably overkill, but I'm anticipating a slow build and don't want things to sag. I've ordered LSLs, (Laminated Strand Lumber) for the beams. Spaced 40" apart so the outside of the verticals align with the insides of the stringers. Next pics should be the real thing!

