Our '99 has 2 sliding wood doors, one closing off the bath area from the living area, the other closes off the bath from the bedroom. Once these are closed DW can sleep in back without my TV/radio bothering her, they do a very good job of sound reduction and privacy.
If the OP is still here I again suggest that he go to the
Alpine coach specific forum on irv2 and "talk" to actual owners with actual experience with these coaches. There are also floor plans for most years at the
Alpine Tech' Library in the Brochures drop down menu.
These coaches are orphans but the support from other owners and even a few folks who built them is outstanding and just about every mechanical part is readily available.