From the hours I have spent on this forum here is what I have gathered:
Glue and nail the torsion Boxes. These are the only parts that get glued.
Paint after you have test fitted and made sure all the parts are working.
Some suggest building from the Z axis outward. That way once you have the pipes and all arrainged, you do not have to take it apart to put the next axis in. If you start with z, then build outward, once a pipe is in, it stays in until you take it apart.
Hope that helps.