When I bred some of the first generation Wyandotte cross chicks mentioned in the linked post back to each other, I got quite a few clean legged chicks. I kept a quad of the better built, clean legged, pea combed, blue laced reds., and sent them up to my Dad's so they would have a few eating eggs. As you guys know good Cornish are not known for their laying qualities, and his whites were no exception. Nor are they known for males keeping good fertility after they get a few years on them. As was the case with Dad's old white male, the last year he was fertile he only hatched pullets. So he was sitting there with some very nice white hens and an old male shooting blanks, so just for grins we put the blue laced red mutt over them to see what would come of it.
This thread shows some of the early results. https://www.backyardchickens.com/t/424132/cornish-side-project
Thank you for showing us the results of your dedication and hard work. Some beautiful birds!!!