Wow those are expensive! They also look really complicated, as in a lot of options. And the fan brackets are angled slightly up, adding the weight of the fans could only worsen that. I would certainly not expect to see acrylic in a $250+ bench, as I have heard that it can/will crack when exposed to LN2, at least all Al/steel. Also, I don't know why they don't use some high grade fiberglass reinforced plastic. That would be very strong (plenty strong enough to hold computer parts), and non-conductive. The only reasons I can think of not to use it are cost (both machining and materials) and possibly static electricity properties.
At any rate I think I'm looking for something a little less than those. Both a lesser product (at least a simpler product) and a lesser price tag. Because for $400 I could get started with an M8/M10. And while the two are completely different "cases" I would rather have the M8. Still on the look out for a bench though. Thanks for the help:)