I love these office/guest bed arrangements - great for a spare room for overnight guests. Not sure about this one as it looks a little bulky compared to some of the others, but it does show the bed/desk action quite well.
The Study Bed
No tutorial on how to make it. It's available in single and double, and excellent for dorms. Surely someone can figure out how to DIY it!
Double Beds Awesome Inventions 2013 | Cool Inventions For Kids To Make At Home Bedroom. Very awesome.