wing ribs are made from strips of wood about 5mm by 9mm.
you build a rib jig (I'll go into that later) and position the next part on top of the construction, mark the angle of the cut with straight edge and pencil.
transfer the piece over to my bench vice. hold the piece without crushing it.
use the coping saw to cut just beyond the line.
use the sanding blocks to sand back to the precise length and position.
glue in place and you're on to the next piece.
plywood in the thicknesses used is easiest cut with sharp scissors or the stanley knife and a straight edge.
honestly in the photo above are all the tools I ever needed.
the vernier caliper is used to check strip sizes and adjust the saw as needed.