This project cost around $40.
There are simpler ways to assemble the base if you're not up for mortise bed hardware.
The process pictures are low quality and I didn't take enough for a proper step-by-step.

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if you can't that may be a cool revision for your next one now that all your relatives are going to ask you to build them one. add some bed hardware plates onto the center board of the end frames so the the back boards would become a lower shelf when it's a coffee table.
how did you do the joinery? it looks like the back boards are plywood with 1x edgeing? did you use a drill press or a router for the bed plates? the top is glued 1x's?
good job!