Sam it is indeed a pretty large bathroom. When I moved in here right after the place was built 9 years ago I didn't like the feel of the big bathroom so I never used it. Then it became a storage room and later my first shop.
There is something very comfy about small shops with everything in easy reach. They are also easier to get and keep a stable RH.
Being organized so that you are not tripping over things is the trick. My towel rods were used to hold lined up clamps, etc. The toilet paper roll holder held masking tape and the Stew-Mac brown tape....... My shower became wood storage and the shop vac lived there too.
How many people have a compressor in their bathtub......

I did
Sadly the guitars that I built in the bathroom sounded better then the guitars that I build now in a larger, carpeted room. Bathroom acoustics are better. Kind of like singing in the shower......
