Spent the rest of the day constructing NG-2. I didn't get it fully completed, but enough so that I could make the gear go to know that it works fine.
NG-2 is a bit of a bear to weld up since it's so critical to get things where they are supposed to go. Just take your time here and tweak along the way. I ended up with the spacing at 3.64 and it's supposed to be 3.65. Close enough!
I still have to add the gussets and make the bushings that connect to NG-1.