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I did not consider the thickness of the boards because I was designing for these "modern" cabinets that have no significant gaps between the parts when viewed from the outside. So board thickness is just an implementation detail :)

But yes, the real designers using the CAD needed to take board thickness into account when designing the internal structure. In other words, this tool is generating a list of my requirements (what I want it to look from the outside + the labels describing what I want each part to be), and then there's the separate work of designing the actual, reality-constrained furniture.

Mid-way through development, once I still had to solve the problems of sharing and printing, I almost gave up on continuing the work because I thought: "it surely must be easier to just learn a CAD application".

But as another commenter highlighted: that meant a learning curve not only for me, but for my wife as well. And then there was the challenge of sharing it with everyone else via email, IM, etc. Having it open in the browser means it's easy to share, and fast and easy to load and show to people anywhere (which is handy during construction).

Yep, when I was developing this I played with some of these non-intended use cases, even though they wouldn't make sense in reality. Technically, what you did was overlay one module on top of another, with the illusion of there being an L-shaped door.

And it would look very weird, but I suspect it may be possible to assemble the cabinets with these odd shaped doors or drawers...