This is what I have in mind so far:
Pen 1: Dorking roos over Leghorn hens
Pen 2: Dorking roos over Minorca hens
Pen 3: Ameraucana roos over Leghorn hens
Pen 4: Ameraucana roos over Minorca hens
I would select and keep only pullets from these pens. Selecting for smallest combs, large size, lightest eggs and friendliness. Of course some exceptions will have to be made at first. I almost didn't want to use the Dorkings due to their tinted eggs but I see their size, winter hardiness, and calm demeanor as important contributions to the project. I decided on Dorking roos for breeding as the hens tend to be stubbornly broody. I may change my mind about this. Pullets kept from these pens will be bred to a Leghorn or Minorca rooster for the white eggs. Possibly a 55 Flowery Hen rooster for color. If I am short on pens I may keep both Leghorn and Minorca hens in with their Dorking or Ameraucana roosters but would like to keep them separate at first if possible. While researching breeds I got into more rare and obscure birds and I simply don't want to use these more endangered birds. The breeds I've chosen are common enough and each come in at least a few colors. I am happy with them for now lol