I would guess that it won't have any impact on the size of the bed. It must be built into the standard front dinette area, as that space is limited in width by the position of the door. It can't be made wider without modifying the fiberglass molds, and if it isn't wider then it shouldn't impact anything in the rest of the trailer.
I think the only impact of this change would be to force a smaller (and presumably single pedestal) table.
I'd be curious to know how comfortable this arrangement is if you have 4 people seated around the table. Is there room for 4 to eat at the table, or is the space limited to a game of cards?
Can you still get the sliding table, or is a single pedestal not sturdy enough for it?
And can you raise the seats enough for Donna to see comfortably out the windows?