Conservative,
I don't know about the CZ75, but there are a number of good books about building a single shot rifle. One of these books is entitled, oddly enough, "Building a Single Shot Rifle".
I don't remember the name of the author. You need to dig around the internet a bit for gunsmithing books. I think that Brownells sells this book. Good luck.
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Joe Portale
Tucson, Arizona Territory
"Those who turn their swords into plow shears,
end up plowing the fields of those who didn't"
Thomas Jefferson