I built a king size sleigh bed about fifteen years ago and I used a trick that you might consider. The bed itself is completely supported by a simple metal bed support frame that the mattress store sold us. It is completely under the box spring and mattress and basically invisible. The sleigh bed, although it looks completely functional, is not in any way supporting the mattresses. It is simply a “corral” that fits closely around the box spring and incorporates the head and foot boards.
I made the joints very strong so there is no racking or movement but as it supports nothing, it gets very little stress and most of the problem areas in bed making are eliminated. To look at it or sleep on it you would never guess.
Just a thought ……
The early bird gets the worm but its the second mouse that gets the cheese.