I saw this custom Raspberri Pi 3 enclosure over at this website here and decided to build it for myself. Unfortunately, the ability to simply order the pieces from the Lego Designer file has been shut down for a number of years, so I had to insert each individual Lego piece ID into the Lego Pick-a-Brick store. It's not the most user friendly experience, but it was way cheaper than purchasing it from a store ($18 vs 35 Euros).
My coworker brought in his Pi 3 and it was a perfect fit. Even tried out Retropie and things were pretty great. Now it's just time for me to complete my own machine with a collection of games.