I like using paper and cardboard for this, dollhouse style, much easier to move things around and visualize that way and more fun than clicking a mouse to boot :^)

Inkscape is good for typing dimensions into rectangles tho

This was my plan B. I do have a scale I can use for it.

I’ll check out Inkscape as well. I’ve tried using some raster graphics in the past, but I couldn’t type dimensions and had to use the rules and guides with snapping. It mostly worked, but was a bit annoying.