One of Voysey's greatest traits was his attention to detail, and designing / specifying the small pieces that added to the whole look. We can take this as far as you like. I'll include a few items below for example. Also consider the use of mirrors, as they bounce light around & make a bathroom appear visually larger.
Shown above are 2 oak towel racks designed by Voysey. Obviously, if you have a ladder style radiator or chrome towel rail you won't need one of these. But if you don't they add authentic detail. They are totally Shaker in style, lovely to use, and labour intensive to make!
Modern building regs insist on ducted ventilation in a new bathroom. This usually leaves a cheap plastic ventilation grill visible, which often look poor. Why not hide this with one of Voysey's 'Bird' airvent grills, and add some authentic design back into the room? Every bathroom needs a coat hook, why not have a Voysey heart-shaped one ?
There are so many options for these, but these will give you a few ideas for oak ones. The Grotesque faces version, above left, was adapted from a Voysey shelf.