I too am in the process of making negatives, in my case I am using Rollie ISO 25 ortho film on my lambda, beginning stages but I have seen negs and pos and I am encouraged.
My aim is to multiple print onto paper mounted to aluminum and with registerd film do multiple coats for a bunch of end process.
Gum over Silver
Gum over Platinum
multiple hits on Carbon BW only
multiple hits on Gum for full continuous tone colour
boy that was a big breath, also Richard Ide and I are making a couple of monstor processors to process large and small films with rotary processing.