First generation would all be black mottled, all be feather footed, but less feathers than a regular cochin. If you cross those F1 babies to each other, some will come out clean legged. If you only use the clean legged ones, you will never get feather legs back again. If you have to use a feather legged F1 because it had the best traits, it would only be carrying one gene, so half of THOSE babies would be clean legged, and so on. Homozygous feather legs can be bred out in two generations, so I would not worry so much about the feathered legs for now, just work on the color and you will get incidental clean legs from time to time that you put in your "premium" pen to start the clean legged line.
If you don't want mahogany based birds, I'd stay away from the SS. There is a lot of nice lighter colored, buff based and reddish buff colors in the MF cochin lines I have. I honestly don't think you would have to cross in another line like SS, unless there was something about them you particularly wanted or needed for the birds you have in mind.
If you don't want mahogany based birds, I'd stay away from the SS. There is a lot of nice lighter colored, buff based and reddish buff colors in the MF cochin lines I have. I honestly don't think you would have to cross in another line like SS, unless there was something about them you particularly wanted or needed for the birds you have in mind.