[subi-crosser]

My daughters playhouse was constructed out of wood skids and privacy fence. I used osb on the inside and allowed any nails, staples, screws, that were neccessary to put anything that the kid wanted on the walls.
She 'lost interest' after a year or 2 so it became a bunny hutch, then a mower shed, and then was torn down and the parts used to make a 2 story dog house.
Kids grow fast and interests change. Take it easy on yourself and look to 'future' uses, since kids grow every day.
Build your motorcycle shed and paint it pink! Then you can paint it whatever you want when she doesn't need it anymore!