Over 15 years or so I've built perhaps 9 or 10 MAME (later Retropie) cabinets because I enjoy iterating. Often I begin the cabinet in cardboard. Perfect way to prototype.
If you get people to that stage, the cardboard-aided-design stage, the next step (replacing with wood) is easy.
I think people who have never built anything of significance often find the very thought of it daunting and so never begin.
In fact, skip the cardboard, I would try to get people just to install RetroPie and play emulated games with just their USB keyboard.
Then you can move up to cardboard + arcade controls.