Not sure about his paranoia over the crystal routing - it's an Atmega, the crystal is 16 MHz. Anyway, I think this is more of a KiCAD tutorial than a keyboard design tutorial (not something particularly high on my list of designs I'd like to do).

I keep trying KiCAD but with a paid alternative (Altium Designer) through work it doesn't compare. The key to electronics design is the library. There are a few alternatives which are tied to vendors, like DigiKey's Schemeit. They have decent libraries of parts. I would have figured that KiCAD would too, but the last time I tried it was pretty bad. Hope that's changed.