I'm all for trying it out, and I'm not going to say anything negative until I see what it looks like mounted up. There isn't anything on the website, and I've never seen it on a 3rd gen. I'm looking forward to it, and I'm really hoping it works! (And if it doesn't, I really want to see what you come up with instead!)
My only concern would be the extruded crossmembers. I've never really been a fan of 80-20, and don't know many people that are, especially for more 'permanent' pieces. I've seen a cart rattle around a shop floor and cringed... The idea of steel threaded into aluminum makes me nervous here. Obviously they've been used and seem to have held up. Definitely makes the price difference too it looks like as long as it comes in close to the other on the site