Twin Beds with Trundle Storage.
Start by making a cut a piece of MDF the length of your bed and height as you want your platform to be. You will have two on each side of the centerpiece. The boxes should have a bottom piece and four sides.

Twin Beds With Trundle Brown

Twin Beds With Trundle Design

Twin Beds With Trundle DIY

Twin Beds With Trundle Low

Twin Beds With Trundle Nice

Twin Beds With Trundle Set

Twin Beds With Trundle Wonderful

Twin Beds With Trundle Yellow