This is an extruded aluminium enclosure with pcb guides matching the dimensions of the detector mother board. The endplates are acrylic cut specifically for the detector connectors and OLED display.
There is extensive documentation; scientific and construction detail (inc. circuit diagrams) available to download and a series of YouTube videos explaining the construction process in detail. These are available via the Cosmic Watch website http://www.cosmicwatch.lns.mit.edu/
For ongoing support there is a forum - https://groups.io/g/muondetector/messages where discussion, questions and ideas can be shared.