Simple Mid Century Full Bed.
You will basically build a large box that will sit up and down so the mattress can rest on top of that platform. Use discs measuring 2 inches thick and 8 inches wide. The side boards will butt against the top and bottom frame boards, getting the extra 4 inches from the thickness of these two boards.
Big Mid Century Full Bed
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Review Mid Century Full Bed
Traditional Mid Century Full Bed
Vintage Mid Century Full Bed