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Would you suggest using the lavender female (just for color, mind you), and the (black) Jersey Giant roo? Or, Lavender roo over (black) Jersey Giant hen? On the other hand, maybe I will just try a few of each and see how it goes.
I know this project will take years. I think it will be fun to watch.
I would start with the strongest body types - males and females that you can get for at least two generations, three would be better.
After you have the best body-type you can get, add a color specimen male or female, whichever is needed. Then I would carefully select the best color and body-type that you can get.
Then, backbreed to the lavender/splash parent to get a stronger expressions of body, while pulling color through until it is strongly expressed. (I am not talking about inbreeding between brother/sister unless you have an exceptional sibling pairing.)
If I break my own rule to inbreed, I like to limit to only one generation. I apply this same rule (one generation) to backbreeding, also. If you push much more than one generation, you will pull bad/fatal gene/congenital malformations/diseases.