Traditional Mid Century Full Bed.
Use discs measuring 2 inches thick and 8 inches wide. Fill the platform bed with a plywood plate to fit over the top of your box frame. Use metal L brackets to build the frame and connect the support beams, and wood screws to attach the plywood to the frame.

Gray Mid Century Full Bed

Interest Mid Century Full Bed

Low Mid Century Full Bed

Modern Mid Century Full Bed

Review Mid Century Full Bed

Simple Mid Century Full Bed

Vintage Mid Century Full Bed

Wooden Mid Century Full Bed