@Keroko: Did Johannes get help from the Wolkenritter while designing his device? Yes, as they would know what stresses a Belkan device would need to be able to go through.
Did the Wolkenritter help with the final building? No, because although they've been maintaining their devices for as far back as they can remember, they lack the resources/knowledge to build one from scratch. Though I'll probably update my copy of his info to clarify this.
I do see a difference between having the skills to keep something in working order, and the skills needed to build the item to start with.
Thanks for the reply.