No problem, another post gave me a link to hunting thruout the world(Mongolia was included), I was astonished to see wildgame which I had'nt even heard of.
Your contact with Richards Microfit(or any other stockmaker) is typical from the U.S., most U.S. firearm industry are just begining to know CZ(so even less Brno). Your delay in time might be a blessing in disguise: CZ is on the verge of releasing an American Classic black Walnut stocked CZ-550, the seperate stocks should be available soon thru CZ-USA(don't forget to specify that you have a fixed magazine) or thru your local distributor. Richards stocks are of the best quality(surpassing what you'll be able to get from CZ) but at a low price compared to other stockmaking firms(higher priced than CZ). The CZ-550 stock fits fairly easily, with only minor modifications compared to your original Brno 600. The major reason Richards asked you to supply a stock is because these firm usually equipped with stock duplicating machines(a bit like a home key duplicating machine), since so many stock variations are available(Monte-Carlo, Classic, Hog-back, etc.) an exact copy of yours is less trooblesome(for you: re-adjusting recoil-pad, scope reticles, and what not).
If ordering thru Richards: this is the time for you to correct a bad fitting stock. Ex. I have monkey arms(being able to touch your toes without bending your knees, in other word: long arms. This situation can be corrected by having a longer lenght of pull.
If need be: I could supply them with a Brno ZKK-600 stock, if your willing to pay shipping(back and forth) to them + insurance.
The ball is in your court.
All the best,
Fred