Share 'tiki 38 with ensuite shower (How can it be done?)'

This is for the Tiki 38 builders, sailors etc. I was curious if an ensuite shower can be built in the Tiki 38. I only have the study plans right now. I am saving up to build my boat as I want to do it debt free. Some models I have seen don't have them. However, I would like to put one in. I would greatly appreciate any help, hints or guidance. Many kindest thanks!! :):)