We also are trying to add more comfortable seating in place of the dinette in our 2015 Windsport 27K which has the same seating arrangement as your ACE. I have looked under the seating and found that the section along the bathroom wall has alot of electrical and duct work under it. The section along the outside wall has two sections of duct in there which I think could be removed allowing the seat to be removed. Please let us know if you come up with replacement seating.
__________________
|