You'll find the digimod described somewhere in the archives of TS.com, but the custom mods performed by Oade and Busman are their own mods and I don't recall ever seeing details of what those mods consisted of, other than a general description of what the mod does (but no drawings and such). In fact, I think I remember reading that Oade removes the labels on the components on the inside of his mods so it makes it more difficult for people to reverse engineer them.