Bear43,
Thanks for the interest. What I mean by "scraped" is that later in their life the MK1s were stripped and scraped. Not that they threw them away at the switch over to Mk111s in 1907 through 1910ish (that would not have profitted the company at all). It was probably easier to discard them than to keep them as Mk111* styles (say in the twenties). The spare parts went to originally configured Mk111 and Mk111*.
I think, in my opinion, that retro fitting them back to Mk1s is not the answer even if the receiver originally started that way. I think being true to the stampings is the way to go. I would love to have just a Plain Jane Mk1 or Mk1* to work on someday. So, for now, we have no reason to bid against each.