I have not opened up that can of worms yet, but have been thinking more about tapers and other non-rectilinear forms. Longer-term I very much want to support a "fill this space" mode for built-ins.
I know I could do the math :P
That works wonderfully. Thank you!
P.S. I showed this to a friend, and he asked if we could mock something up, export the dxf, and send it to a cut shop... you could end up with your own flatpack pipeline.