sounds good to me Nicalandia,
And no JJ like they said, just on the pullets, the males will be what is sort of a yellow quail. There's been a few posted way back on here that I feel are from similar crosses.
You can take these hens back to you silver male though and go from there, or if you back cross the F1's to each other, you should get a few males that way too. Wonder if they would have any leakage at that point still though? I would focus more on breeding back to the father. Use seperate lines of quail hens to help keep the blood from getting to inbreed if possible.
Another way you can do it to add to you lines would be to cross the silver quail to a good blue or preferably a splash.
All would be blue the first time, The F2's will give you some blue silver quail. From there you'll get blacks too and would be somewhat of a fresh line to work with as there are currently only 2-3 lines of silver quail in the states, so they need a little new blood in them any way. I'm doing it the long way with a lavender version myself, but do plan to put them over both blue and dun next spring too