We too want to replace the couch with something else in our 2009 210WBS. The dinette is ideal but we also have three young kids that need sleeping arrangements too... & they don't always get along. Thus we want to incorporate some sort of bunk bed(s).
Currently we are considering something like this link (Deep Red - A self-build motorhome - beds & seats
) except with further modifications to allow us to have a dinette with three to four beds.
Won't be starting the DIY mod for another month-ish but will update this as it goes along.
This site was extremely helpful for us in previous years whilst we dealt with the continually ongoing repairs that our da*n FF always seems to need.., thus have finally decided to join with hopes of helping others too now!