You might be able to take that last one and rotate it a bit and then use the length of the mattress to establish scale. That would enable you to come pretty close to some measurements and a pattern. If you would like to experiment with that one I'll help you out.
I accept the plank! Is it Oak? Ha ha! Those are some really nice beds. You should be able to get some good ideas from those pictures. As a kid I always loved Pirates, and related stuff. The treasure chest at the foot of the bed is also a great idea.
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