Interesting, thanks for sharing that one. And good point about price.
I've gone the DIY route myself, as woodworking is my other obsession. My lazy side was thinking it would be nice to be able to drop prepowered, prerailed sub-units into a cabinet of my own design so that I could focus on the woodworking side of things. One downside of this would be the constraint of the standard fixed widths (84 and 104, etc.), and I like the flexibility to choose my own widths. (My first build incorporated two 200hp rows, as I needed the width in this multipurpose cabinet/cart to accommodate a couple of keyboards.)