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That is a American Queen-sized bed but the frame I got from Europe via eBay. So I took the sides and made a tongue with a jigsaw. That way I can extend the length of the frame. The frame does not support the bed, you can see the little legs under the box spring, another "Euro" type setup.
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The headboard was where I wanted the strongest structure. Thankfully, the headboard was where I could use through-bolts. Here you can see eight 1/4-20 bolts securing the L-bracket. I intended to have fender washers under all the bolt heads, but I am unable to count past the number of fingers I have. You can see the washers pulling in from crushing.