I have gotten to the point that I could design furniture in a spreadsheet. That's mostly what I do already; I'll design it in FreeCAD, I use the Spreadsheet workbench as a table of all critical dimensions, and then I'll build the CAD model from there, but I draw less and less of the model. I usually just take a copy of the dimension spreadsheet with me into the workshop, very rarely relying on drawings unless I've got some intricate joinery to lay out.

I'm working on a case for my grandfather's flag, and I modeled a part of the thing as a sanity check.

I might just do it as a challenge to myself, design and build a piece of furniture in LibreOffice.