Did somebody say this was a good idea but not on a tempest? What would it be a good idea on exactly? No offense, but if you understand how the wii works and how you are supposed to play it and how an arcade cab works and how you are supposed to play it, this is the stupidest idea in the history of stupid ideas.
First I'm going to completely ignore the fact that a prefectly good tempest cab was butchered.
You need room to play the wii. As a matter of fact, the wii ir sensor won't even pick up unless you are three feet away from the tv. You know the sides of the cabinet? Ir can't magically flow through them, so two people will never be able to play because the sides block the sensor bar. Heck, since the inside of the cab is so small, I doubt one person would have an easy time playing it. An arcade cab requires you to stand really close to the monitor. It is huge not to accomidate the hardware, but to accomidate the giant control panel. A control panel that this cab now lacks. Since I've already stated that you can't play the wii up close, what you basically have here (or would have with any arcade cab) is a very expensive, space-consuming, tv stand, which blocks signals from the ir sensor and has the monitor at an extreme angle, thus throwing the accuracy of the sensor off.
Oh and don't mention virtual console games as they are console games and have no business on an arcade cab.