This is a housing for the A20 single board computer / Dev board from Olimex. It's styled after the Wilson hall building at the Tevatron facility. For best effect (I.E. resemblance to the original building) it's best to print everything except the bridge sections in a cream/light-grey/stone/concrete type filament and the bridge in translucent colourless which also lets you view the status LEDs through the case. Other colours will give a more dramatic but less realistic effect.
This case will contain the A20 board as well as a 2.5" HDD and a backup battery and has some room for additional custom PCBs to be housed inside.
The sides of the case are printed in 2 parts which need to be glued together while using the bolt holes to assure proper alignment. The central bridge section is printed in 2 parts but they don't need to be glued as they'll be retained by the 4 M5 bolts that close up the housing. Internally parts are retained by the support clips and by small wood screws.