https://en.wikipedia.org/wiki/Pantograph
I have to engineer a wooden step to adapt
differing heights in two floors. This has to fit
within the cut walls and meet up with skirting
boards etc. Is there an app to trace around
the relevant edges and so make a pattern on a
piece of timber for subsequent fret-sawing?
It would be like a mouse, I suppose.

Almost any CAD or Building design software that supports component
configurations should do what you need.

--
Garry

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