Your floor plan is the same as ours. Montana 3400. But I have a desk top computer and printer on the desk so I sew on dining table. And where you have the 2nd sewing machine we have a model railroad.
There is a lot of storage room in most RVs and each person can personalize their space. At some of our rallies we have a "Show and Tell" and it is amazing what some people have done to their rigs to make it "theirs".