Need help with a custom 0.22 Barrel and bushings for condor

Hello,

I have an Airforce Condor in 0.177 caliber with the new 0.177 tank. I am not able to get my hands on a 0.22 Lothar Walther barrel to convert my condor to a 0.22. Assuming I can safely do this, I would like to cut the barrel of a 0.22 air rifle and machine it to fit the condor.

My questions:
1. The barrel is about 16″ long after being cut. What are the specs for the barrel at the breech end for machining? Please let me know if there are any schematics for this.
2. What are the specs for the bushings and positions for installation on the barrel? What are the bushings made of and how are they fixed to the barrel?
3. What else do I need to do to make this work?
4. Will this work?

Please help me guys!