I bought a desk and chair for my daughter on Craigslist awhile back, but it did not include a hutch. I decided to add one and recently completed it...in addition to painting the desk a fresh white and then repairing the chair, painting it, and recovering the seat!
The hutch build was pretty straight forward and I used a Kreg Jig to assemble most of it. I built it to sit on the desk (not attached) but I included a cleat at the top to screw a couple of 3" screws into the wall studs to keep it in its place. It's nice and sturdy. I plan to add some puck lights under the bottom shelf soon.
The Lego house isn't quite up to Momplex standards :)