WALK IN SHower - no glass. Water can still "ricochet" and splash out the opening. You might want to consider adding a short wall that sticks into the shower. It only has to be to long to completely block the opening.
This is a perfect combo of my two favorite ideas for that space under the stairs leading to the basement. A reading nook AND book storage and shelves . assuming that there is enough space for this there.
Create a bunk room in an otherwise unusable attic space. Back-to-back beds fit just right in this long, narrow room. Built-in storage maximizes limited square footage. The under-the-bed drawers are great use of space