We bought a new Cal-King mattress several months ago and haven't been able to find a bed frame that we were happy with... so I built my own. I had the general idea from several websites, however I designed it differently to allow for storage under the bed. The basic materials are 2x12's for the base, on top of that a 2x3 frame, followed by MDF. I forgot to take a picture of the completed 2x3 frame with all of the cross supports in place, but I'm sure you can get the idea.