I think the plan was to remove the barrel from the Brno action and install it on the CZ, rechambered to 30-06. There would probably be no issues with feeding 30-06 ammo through the 9.3x62 action. But, if it were me I would opt for building a 308 rifle on the Brno barreled action. Ernesto would only need a stock, and perhaps a trigger, safety, and magazine box. Even having a gunsmith assemble the rifle and bed the stock would be far less expensive and the investment would be much safer. It is certain to work, as compared to a switch-barrel, take-down rifle. He could probably do it himself.