Full size does not have the third leg on either side but does have the support bar down the center.  The frame is heavy upon delivery instructions easy assemble place legs carefully, if adding headboard would not be able to use one of the short boards or you would need to drill holes, etc.  Very nice teak color (rustic).  Daughter is enjoying it! Using it with the Wayfair Sleep 10.5 Hybrid Mattress (Purchased together)