Logical, usable and simple craft rules!

[Eldritch_Lord]

For what concerns level, you are right: I admit that I made up this system with low level characters in mind, and basically NPC, who don't rise very high in level.

Keep in mind also that the "realism divide" (where characters go from "pretty much realistic" to "superhuman") is around 5th level, so if a crafting system is mostly realistic only below those levels, that's fine. Above those levels, you have things like the dragonlances in Dragonlance being crafted in a day or so each, or Anduril being reforged in a week-long(-ish) montage in LotR, which are suitably heroic endeavors that having a legendary smith finish them in such a short time is more appropriate than not.