Glad to have you join us.
Not sure about that particular floor plan , but friends who had a 32' Cougar, had issues with the step riser height , nearly 9" compared to 6>7" of most other manufacturers. Access to the roof vent ( poor placement on the up slope ) required a 2 step, ladder to open ., and no wiring in the ceiling to power a Fantastic Vent fan when they went to have one installed.
These may not be problems with this particular floor plan , and theirs was a 2011, so things may have changed.
EDIT: I'll go to the website and see if I can pick out their floor plan.
Furnace ducting to the rear of the 5er and t'stat placement at the top of the stairs, made for a hot bedroom and cool seating at the rear while watching TV.
Re-edit: theirs was a 318SABWE, from the online pictures , I would question the steps on the floor plan your interested in too. No real perspective but, JMHO, for the height difference , I think there should be more than 1 step to go up that far.
Have you been able to tour one of these 5ers? Definitely wouldn't want to order one without a lengthy walk through.