"Built-in Bed" for the Loft Bedroom~

I mentioned in my post on Boys' Space Inspiration last week, that we are in the process of turning my loft home office into a bedroom for my oldest boy.  The loft is on the small-ish side, so we needed to think creatively in the area of space management.  After studying the space (and measuring it about 100 times) I decided that creating a "built-in" bed was the best option.

I am putting