* Well, this (my sample above) was a bit simple minded.

* I actually wandered into the workshop of a local luthier (no guitars, but classical violins) and looked at samples of German Baroque string fiddles and an Armati / Guarneri violin in pieces.

* I still have no knowledge of the construction of Gibson / Gretsch et al archtops, but I can assume the geometry is related.

*

* Splines will need to be closed and at the perimeter angular curves. This will allow a precise control of the curvature and thickness of the archtop generated by the loft creator. This is a quite laborious and extremely fiddly fine tuning of splines.

* You will need to acquire significant skill and experience to produce a 3D model which is useful as input for numerically controlled machinery.

* I actually wandered into the workshop of a local luthier (no guitars, but classical violins) and looked at samples of German Baroque string fiddles and an Armati / Guarneri violin in pieces.

* I still have no knowledge of the construction of Gibson / Gretsch et al archtops, but I can assume the geometry is related.

*

**A simple loft of linear splines seems useless**.* Splines will need to be closed and at the perimeter angular curves. This will allow a precise control of the curvature and thickness of the archtop generated by the loft creator. This is a quite laborious and extremely fiddly fine tuning of splines.

* You will need to acquire significant skill and experience to produce a 3D model which is useful as input for numerically controlled machinery.

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