Aegir and Ragnarok 2 transformers started completely different, then became a single design, then became two designs again, mainly due to the different requirements of the designs. It turned out that Ragnarok 2 needed lower-impedance secondaries, which changed a lot of the design. There was a ton of back and forth on that. In retrospect, not super interesting. It would have been ideal to have the two transformers be the same (except for shielding), but that didn't work out. The Ragnarok 2 transformer is pretty much as I described--it's wrapped in a mu-metal shield, then the whole thing is dropped into a welded steel box and potted with epoxy. It's literally embalmed. And nope, none of that's going to end up in Vidar--WAYYYYYYYYYYYYYYYYY too expensive.