Screen: https://www.amazon.com/gp/product/B01D17GPI4/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Joystick Buttons: https://www.amazon.com/gp/product/B00XHLVUBM/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

Computer (Pi 3 B+): https://www.amazon.com/ELEMENT-Element14-Raspberry-Pi-Motherboard/dp/B07BDR5PDW/ref=sr_1_8?s=electronics&ie=UTF8&qid=1542605620&sr=1-8&keywords=raspberry+pi+3

1/2" MDF: https://www.homedepot.com/p/MDF-Panel-Common-1-2-in-x-4-ft-x-8-ft-Actual-1-2-in-x-49-in-x-97-in-M31240849097000000A/202332602

Switch for LED Backlight: https://www.amazon.com/gp/product/B007B86Z94/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Fused Socket Switch: https://www.amazon.com/gp/product/B00F4MGRRE/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

USB Panel Mount Extension Cables for Rear USB (for USB Controlers/Etc): https://www.amazon.com/gp/product/B012C4EZP2/ref=oh_aui_search_detailpage?ie=UTF8&th=1

Power Strip for Inside Cabinet: https://www.amazon.com/AmazonBasics-6-Outlet-Surge-Protector-2-Pack/dp/B014EKQ5AA/ref=sr_1_3_acs_sk_pb_2_sl_1?s=electronics&ie=UTF8&qid=1542605919&sr=1-3-acs&keywords=power+strip

LED Strip for Marquee Backlight: https://www.amazon.com/dp/B07CVRVPRM/ref=sspa_dk_detail_0?psc=1

3D Printed Parts: For Rear Power and USB panel, Monitor Mounts, and Monitor Control Rocker Buttons to access underside buttons from front of arcade with a clean look.

For Software... I like Recalbox = https://archive.recalbox.com/

For roms... look in the usual places.

For extra controls... you can use wired USB controls, Xbox One S Bluetooth COntrollers directly to the Pi 3 B+, or I like these for RF wireless ones: https://www.amazon.com/gp/product/B01KVBL4U2/ref=oh_aui_search_detailpage?ie=UTF8&psc=1