Our plan was to install two twin bunks across the front in place of the double bed. However, we were seduced by the big front window and changed our plan so as to not obstruct the view. So we modified Marco's interior to look like this:
Then it was off to Ikea for a twin size bunk bed set. Then it was in with the new:
We already like the new interior arrangement much better. It is a no-brainer tradeoff for the front window view. Live and Learn, Eh?