Designed for 1/2" (or 7/16") stock. Example was prototyped in OSB.
Three easel cuttings required (I can’t link to these directly, for some reason):
First set of legs and top:
http://easel.inventables.com/projects/kuPcYx4saYlleZxEV_oc0Q
Second set of legs and the ‘lower top’:
http://easel.inventables.com/projects/M-_GIihHWKND9Zks0YnYzQ
And the ring (cut two of these):
http://easel.inventables.com/projects/dznYYBxuFpMmXVgNaJDSbg