You've pretty much got it. I can't comment on material cost, but the labor savings is awesome. I'm not a pro, but I'm doing my kitchen in Metabox right now, and it's *almost* as easy as it looks on paper.
1. Carcasses- standard 32mm. Any system will work, I used LR32.
2. Drawer boxes- incredibly fast, once you've re-read the instructions 4-5 times. If you make a jig for the holes underneath, you'll fly through this. I made a bracket for my DDF40, similar to a Domiplate, that let me drill both holes in a single plunge, referencing the corner. Stupid fast and easy. I used 1/2" Baltic for the bottoms, bought before the..... events.... happened over there, and jacked the price up. It's not as easy to clean as melamine bottoms would be, but I like the two tone look when I open the drawer.
3. Drawer fronts- the fiddly part. You really DO need to measure things the way the instructions show, using the cabinet dimensions minus the reveal. Otherwise, it's a ton of math to come up with the locations for the 10mm holes for the brackets.
The brackets also have left-right adjustment space, and no reference point for "center", so it doesn't matter how accurate your 10mm holes are, once you install the fronts, they'll need adjusting- You have to adjust the spacing, to make the drawer rails parallel to each other- then ALSO adjust the lateral position of the front, to match the reveal. It's the same adjustment screws for both, so you have to do them simultaneously. Which is tedious, but not rocket science.
Adjusting up/down is easy though, the Pozidrive cam works really well.