I demolished the room down to the framing, which turned out to be Douglas fir 44s, and carved out an alcove under the stairs to fit a modern toilet. We bought back inches for the footprint by flipping the swing of the door and installing a heating mat beneath the tile so that we could tear out the bulky radiator. It took two years, but we finally have a finished bathroom with the period style we love.
Shown: Improvising to stay on budget, Jeff constructed the medicine cabinet out of leftover floorboards and baseboards. The bath's new Douglas fir trim echoes vintage wood floors and accents in other parts of the house.