I tried OpenSCAD but it ends up being too abstract and hard to maintain for me and like others it does not solve fillets/procedural selection well.

So here is my shameless plug "sograph": https://imgur.com/a/u1n2Grg

I should consider a Show HN instead, but it is too early to release yet.

A similar tool which directly makes OpenSCAD code is:

https://github.com/derkork/openscad-graph-editor

(though you'd want to import BOSL2 to do fillets and so forth)