I'm not sure that analogy holds in the case of videogames. You can, in theory, JUST play the games that were made when the console was actively sold by the original manufacturer, just use the original controllers that it came with, just use the RF switchbox that originally came with it, and play it on an a TV created in that era. In the Atari 2600's case, that was roughly from 1977 - 1992, and if you stuck strictly to stuff from that time period, you'd be "authentic". However, that's presuming that videogames are "solitary" and "static" items, like your Deuce coupe. That might apply to a home Pong console with built-in games - it can only play, and was designed to only play the games it has built-in - but not to a device designed to play an infinity of new games and have things (typically controllers) plugged into its "expansion" ports.

Bottom line, new homebrews (and this applies to both software and hardware), no matter how they're made or with what materials they're designed, if they work on an original, unmodified system (in the 2600's case, going all the way back to 1977), then they're completely authentic, no matter how much they might relatively be tricked out. The development tools/environment don't matter either, because each company had their own setups anyway (again using the 2600 as an example), be it using terminals accessing mainframes, or even Apple II's. There's no "right way" to do it.