Decided on 558mm (22in) for my rod lengths simply because that will make the whole thing fit on the 24x24in bit of MDF I have for the base (and it will fit through doors fully assembled).

Cut the rods with a saw and cleaned up the ends so they are all the same length.  This produced some very nasty dust.  Duh.. it's fiberglass after all.  My hands itch now.

The bottom frame rods were not really needed, but they made getting everything perfectly aligned so easy I kept them.

The center push rod is a thin wall steel garden stake stripped of it's protective plastic.  It was just as stiff as the fiberglass driveway markers I used for the frame, and less than half the weight.

The reveal..

At this point I realized that when I add the lines the tension will hold everything together, except for the base.  I'll still need to glue and screw that down.

So I've decided to glue the top/bottom triangles but leave the vertical riser rods free.  That will let me 'flat pack' this printer for transport by removing them.