Mark...I think the colaborative work so far is outstanding. It think it would be helpful to see some additional rotational views of Dave's rendering to better understand the dynamics of the piece from other angles. That would allow you to see if you really want to push the rear "legs" out to the edge or keep them inset.
But in general, I think this adaptation of the sleigh bed style would be perfect for the space and it still echos, to a certain extent, the feeling that you MBR has even though the tables are separate rather than integral to the unit. It may be good to not exagerate the "swoop" on the headboard too much since the tables are pretty simple and angular. Too much curve and they might look uncomfortable together. I'm also trying to brainstorm a way to carry just a little SS to the headboard to tie things together when the foot-end legs are not visible...
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Dave, I've been trying to entice Mark to SketchUp!, too...
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The most expensive tool is the one you buy "cheaply" and often...