Apart from the gold plating on the fasteners, this does not appear much different from almost any Euro (IEC) control panel.
Indeed, it is fairly common for Euro enclosures to be made of clear plastic, with but a small hatch to access the toggles.
Not UL? Not always an issue. UL is better seen as a 'guide' than a 'god.' That said, if you are not comfortable with a piece of equipment, are not certain you understand how it operates, what you need to do, there is no shame in backing off.
I haven't declined a job since.... yesterday.
I would reccomend getting comfortable with this stuff, though. Open up a commercila door opener, a hot tub, or a pre-fab motor control center, and you will very likely be looking at some familiar stuff.
Oh- and as for the gold... Did you know the older style TV tuners had such plated contacts? Gold is a great conductor, and is quite corrosion resistant. While doing so would bring any UL listing into question, I think this is one "modification" I could live with.
