I’d screw “blind bolts” in through the back side and then through-bolt the plywood through new holes in the frame.
Or you could build the entire box and drop it over the frame, like an inverted shoe box. I would reinforce it from the inside and glue/clamp it, in addition to screws.
We have a California King mattress set inside a waterbed frame. It's so hard to make the bed. Have to lift the mattress out of the frame. Can't really afford a new be...
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I’d box it in with plywood.
I’d screw “blind bolts” in through the back side and then through-bolt the plywood through new holes in the frame.
Or you could build the entire box and drop it over the frame, like an inverted shoe box. I would reinforce it from the inside and glue/clamp it, in addition to screws.
Hello- not sure what you have now-here's a plan for construction of a platform storage bed. I hope this helps
Hailey Platform Bed Frame | Ana White
http://www.ana-white.com/woodworking-projects/hailey-platform-bed-frame