Great idea for lego storage! Instead of flat surface, add lego mats. Creative Solutions for Small Space Play: Underbed Play Table with Drawers by Great Little Trading Co. (does not ship to U. but think of the DIY possibilities)
Open Design Tall, clear-glass shower doors create the illusion of more room. The white subway tile and chrome fixtures reflect light, contributing to the sense of spaciousness. Basket-weave tile covers the floor and carries into the shower for continuity.