Bo, and for who is interested, just to give a second view with examples.

Why no drawing software?

Try to open these pictures with paint and enlarge them
Look at the x and y coordinates on bottom left side of the screen to make distances readable.
With this simple tool any picture is easy to compare and calculations, also three dimensional if needed with the use of these 2 dimensional coordinates are possible so no CAD but Paint, that’s one of the important software tools for me.
Picture 2 does show what’s possible with rectangular figures on special made combined pictures..
CAD and laser cutting haven’t much to do with the process of redesign and reconstruction of classic pattern planes.
For me it is more an art like sculpting but with the use of calipers, a pair of compasses and a drawing board.

Cees