"E", you could also use the chart table type pull out model for "temporary" counterspace all along the aft of the cabin and above your new sleeping quarters. Could be useful for cooking or navigating or whatever, i.e. when you're not sleeping in the space immediately below.

A recent Ariel that was sold,"Tullen Tie" or something like that, had these pull outs. I may have downloaded some pictures of it at home. But it seemed like a very practical idea. (And yes, Bill, I 'searched' but didn't find that thread...)