

Having experimented with this a lot, I’d say it depends :P
Keyboard only you can get by with 5fps or so, but there’s no real feedback at that point.
15fps is ok and quite usable. Artifacts are the more annoying thing at that rate. 30fps is really more then necessary (though I agree higher is nice on lcd displays).
What bothered me most is the limited contrast, pixel density and limited amount of colors on color eink display.






FreeCAD’s Arch/BIM workbench
Draw in 2D to create 3D walls. Position windows, doors and others in 3D. Some features like the roof or stairs have their own modules.
You can always fall back to one of the other many workbenches should you need something not part of a typical home (weird stairs, a detailed cupboard, …).
I could not find documentation easily in the past but it likely exists. For a video introduction the FCBLounge channel (YouTube) provides great visual tutorials.
I’ve documented part of our home in this to ideate remodeling. It can be used for pipework but I did not try that yet.