adding a bathroom

This is where I think I'll be adding the bathroom for the house. It will be narrow so I've made the room long. I figure I can squeeze a bathtub in the back but I may just make it a shower as my attempts to build a bathtub have been a comedy of errors and learning experiences. The pointed bit on the left would just translate to counter space behind the bath (if there is one) since that would just be a really awkward and pretty much wasted bit of space otherwise. This is not set in stone but something I have rolling around in the back of my mind until I get to the second floor.