After the first season I decided to remove that smaller third bed and although the end result worked out fine the problem I ran into was that the screws securing the bed frame to the side and end walls were run in from outside the trailer beforee the outer skin had been installed. Obviously I couldn't access those screw heads from inside the trailer so when I pulled them out they did do a fair amount of damage to the walls inside the trailer. Those along along the curb side of the trailer I managed to hide with a new, higher top for the cabinet sitting below, those on the rear wall I patched and covered over with wall border that was similar in design to that in the rest of the trailer. Obviously I don't know how your particular unit was constructed but it wouldn't surprise me if the bed was secured in a similar manner.
Looks good. We're thinking the same thing about our bunks. If we can unscrew the platform from the bolted section (attached to the outside wall) then it'll work. I don't mind not having a total removal of the bunk, as long as the front facing frame and platform the bed rests on can be removed. We'll have to take a look next time we're in the RV.
We recently replaced the front TV and bedroom TV, huge improvement!