I'm in the exact same boat as you are. Right now, I'm doing my best to work with FreeCAD, but Blender3D has an interesting precision-modelling plugin that makes

I'm in the exact same boat as you are. Right now, I'm doing my best to work with FreeCAD, but Blender3D has an interesting precision-modelling plugin that makes for a somewhat complicated but reliable alternative. You're going to need to watch a few Youtube tutorials, but it may be worth it.