Great Trundle Twin Bed.
Leave 1/2 inch in extra length and width so there is room for error. Flip the bed on wheels and put on each corner of the bottom of the trundle bed, using screws to keep the wheels in place. Painting the trundle bed to match the main bed.
DIY Trundle Twin Bed
Good Trundle Twin Bed Ideas
Great Trundle Twin Bed Ideas
New Trundle Twin Bed Ideas
New Trundle Twin Bed
Simple Trundle Twin Bed
Top Trundle Twin Bed