RE: Plans for 3.14
Took a look at your files for cutting.
The ribs I think are too thick at 3mm plywood. Consider 2mm plywood. Here I have been using 2mm balsa with 1.5mm reinforcements at landing gear mounts.
Many-many parts could be connected to one another. Those with straight side could be butted up against another with straight side, allowing the laser to cut one line for two parts.
The locking tab gap on plywood parts is too big. Make only about .030 to .040" gap. Use only two gaps per part, and one gap to lock in an internal, or cut out section. Birch plywood will easily hold together better than balsa. So go to fewer and smaller gaps.
Get rid of the acute angle cut areas. Put a small radaii fillet in instead, or you will get little extra burn mark, and not get same strength.
As to slots for interlocking parts. Do not make same size. Instead purposely cause an interference fit by about one diameter of laser light.
Wm.