Can't help with floor plans, other than to say that once we got the following that one or both of us wanted:
Walk Around Queen Bed
At least some outside storage
Pantry
Sofa AND Dinette
we were at 31-feet!
There used to be a 27-foot two-slide Winnebago with circular dinette. Don't know about now.
I'd agree with the Thor products being low on the quality/customer service end of the spectrum. Top end??? Of "production" coaches, Winnebago, probably Nexus, Phoenix Cruiser. Ultimate Class C end? Lazy Daze
I think Jayco is one of the better "production" coaches. Like the rest, nowhere near perfect. But I think they're doing a play on words about fiberglass nose cap. Theirs is probably standard, and there's probably an option on at least a few others. I'm thinking the Forest River Sunseeker/Forester and the Fleetwood Tioga models.
A fiberglass ROOF is a very nice thing to have. Used to be on every Winnebago, then a few didn't get them, they may be back. Some Forest River, some Jayco, Nexus, probably more. BUT the way it's implemented is important! If it's crowned for runoff, and rolled down a few inches onto the sides, that's fiberglass roof done right. If it's a flat sheet, installed between edge moldings with sealant, that's not much if any better than the rubber sheet used by most.