The project will supply case, controller, pad card, nuts and bolts. You will need to source a micro USB cable and switches (vintage IBM or Ellipse). You can use either XT (pin) or AT/122 (buttress) type barrels. If you already have one of those boards that you don't use - this project may be for you.
The layout uses three 1.75u caps - the "caps lock" position, right "Shift", and right "Ctrl". All three are available (un-stepped) from Ellipse. Unicomp standard printing offers blank, "Ctrl", and i think "lock" symbol only too. Unicomp custom prints are another option. The "small" spacebar would come from Unicomp. Might include some of those caps depending on interest.