New Breed????????????????

[The Moonshiner]

I think this chart the OP posted shows it a lot easier

 

[Egg Snatcher]

You can't lock in heterozygous genes and expect them to breed true for the same heterozygous gene offspring. That's the rub with mixing two breeds and trying to establish the offspring as a breed.
Heterozygous birds don't and won't breed true. Just because I'm a color/pattern guy I'm gonna assume those birds pattern look as they do because of heterozygous genes. You'll never get that pattern to breed true and that's just the pattern let alone any other traits that would be involved in the project.
It would be far easier and achievable to maintain a group of both original breeds and continue crossing them to reproduce the same hybrids and selling those if that's the look the OP is after.

Agree

 

[RoostersAreAwesome]

Shame, what is considered a new breed? Would it be from a mutation in one of the genes to make it significantly different. Rather than a mixed breed like what I have.

Most breeds started as mixed breeds! I say, go for it, and if the color doesn’t breed true you can always just focus on type and other traits. There are plenty of landrace breeds that have varying colors, such as Icelandics. And you don’t even have to make them an official breed, you can just breed them to suit your own needs, like this person did: https://www.backyardchickens.com/threads/catskill-homesteader-breeding-project.975521/. Plus, if you start breeding them, you may find a true-breeding color that you like even more.

 

[LGegzna]

Amazing looking birds! Great work. They are beautiful.