We have a Silverback rear living and our son who weighs about 110lbs sleeps great. No problem with storing, etc.
I would AVOID a jackknife sofa as the center split is nearly impossible to get
Just say'n from experience.
Only thing is the door can't be opened with slide outs in. But definitely nice to have it this way while using the trailer.
I love your layout and it will work well for our family of 5. How did you go about special ordering the custom bunks and window? Did you go through a dealer or did you contact forest river directly. Sorry if this is a basic question, but I am new to the rv camping and am looking to by this model unit.