The Samurai dude builds his son a live edge slab bed in this touching video:
Several comments questioned his placing the mattress on a panel (instead of slats) which restricts air flow under the mattress that could result in mold growth.
I question his judgment using walnut (splitting) wedges @ 4:35 tensioned against the horizontal grain of the headboard/footboard. I woulda thunk the split repair @ 3:30 with the long screw should have been a clue. What was he thinking?