The folder pcb contains schematic and gerber files, as well as mechanical information.
the folder docs contains an html version of the assembly instructions. use this link to access https://projects.w6ipa.com/megakeyer/Mega%20Keyer%20Build%20Instructions.html
The project can be put in a box built from acrylic plates, 3D printed facade and standoffs. the file for the facade is here : https://www.thingiverse.com/thing:3581751
Code for the project is available here : https://github.com/w6ipa/k3ng_cw_keyer/tree/mega-keyer-v1.1