I raise mine as true "dual purpose". We send all the excess roo's to freezer camp. As for caponizing, I read all about it and tried it ONCE, I couldn't find what I was looking for, so I stitched him back up and he lived until he crowed...then he went to freezer camp. As for size, since they go...
Here's a "Nature vs. Nurture" with my Fav's. I had a Fav hatch a dozen eggs and I had an Australorp who was on day 6 of being broody. I didn't want/need any additional chicks at that point so that night I swiped 2 Fav chicks and put under the Australorp. The Australorp was my top hen and the Fav...
Looks like you've found your answer of Silver Gray Dorking pullet cross, but definitely not with a Faverolles. If it were a Fav cross, it would have slightly feathered legs by two weeks. As for eggs...usually you end up with the blue/green if dad was indeed an Ameraucana. Dorkings are fabulous...
I am looking forward to following the outcome of this experiment. I have a pair of Dorkings and a trio of Faverolles (7 wk old hatchery chicks) and was considering crossbreeding at some point just because they are both supposed to be such good meat birds. I have a good bit of time before that...