Sorry… you couldn’t find it because it wasn’t there, other than as KiCad files. Now there’s a PDF. Also the repo’s kind of confusing, but I just added a docs folder to make it easier: https://github.com/holmesrichards/dac_ino/tree/master/docs
The schematic’s a bit (maybe more than a bit) confusing because the repetitive parts of the circuit are handled with KiCad heirarchical pages, so you have lots of pages with only a few components on each. There’s also a PCB layout which might help or not, and I moved the BOM to that directory as well.
It’s a lot for a stripboard, I think, but if you’re up for it, do it! (If you just want one quantizer of course you can leave out half the inputs and outputs.) By all means post a layout here if you do succeed with it.