Aloha Jorge61,
Who's on the top bunk?
Crossing the bunk beds perpendicular at the end of the beds can be a creative solution's to space needs, but it's not a great solution for the bottom person's legs that have the upper bunk crossing over.
The lower ceiling for the upper bunk isn't ideal, but it's not an issue (unless you have images on that ceiling).
Much Love, Shawn