A friend of mine was faced with the same thing a number of years ago and he went ahead and stubbed up his pipe for his toilet and cut a hole in an old garbage can and put over it and kept a little trash in it during inspection times and they never saw it and he has a toilet in his today. I was fortunate as I poured my slab under my barn after it was built and inspected so I was able to get around it that way, plus I was fortunate enough to already have an existing septic tank and drainfield in place.I wanted a bathroom but they were going to make me put in a separate septic system that would have cost at a minimum $12,000. I’ll just go behind a tree.
Impressive trim work inside and out suggests this shop may include a dedicated woodworking area.Lots of craftsmanship and thought evident in your build.