https://www.amazon.co.uk/gp/product/B0713PGNHD/ref=ox_sc_act_title_1?smid=A3AQ09I6U6BSNN&psc=1

https://www.arcadeworlduk.com/products/insulated-daisy-chain-harness-with-32-crimp-connections.html (2.8mm option)
https://www.arcadeworlduk.com/products/single-1-metre-long-insulated-2-8mm-crimped-wire.html (need 15 of these)
https://www.arcadeworlduk.com/products/PCB-Feet.html (pack of 4)
https://www.arcadeworlduk.com/products/Sanwa-OBSN-30-Arcade-Button.html (just one of these)
https://www.arcadeworlduk.com/products/Sanwa-OBSN-24-Arcade-Button.html (14 of these)
https://www.arcadeworlduk.com/products/a-to-b-usb-2-0-cable.html

Case: https://www.amazon.co.uk/Storage-Keepsake-Unpainted-Documents-Valuables/dp/B07926KBJS/ref=sr_1_10?keywords=wood%2Bbox&qid=1575592443&sr=8-10&th=1