Don't know if it has ever been done or not but I am wondering what would the offspring be if you breed a silkback to a silkback. I have never heard of this being done yet so I am just wondering.
It wont be all Silks it will be some silks and whatever isnt a silk will be a leather you will have no normals from what I have read.
But Tom is right it will be a large mortality rate in the clutch as well due to breeding two unstable genetic deformities to each other. If you want to do it do it. All I can say is good luck.
The "morph " dragons are not geneticly enhanced. They are on the other end of the spectrum. The traits that are being bred for are genetic disorders that people like the look of. So what it comes down to is this. Someone will pay for it, so one way or another someone will provide it.