If and when I do this;
"There is no discernible difference "to me" between a pro package I have on a PCR that CGW did, and a CZ75B that I did using David's parts. I say do it yourself! He's really busy right now, so you'll avoid both expense "and" wait. He's also "always" really helpful, and you get the benefit of getting to know your gun (if you don't already)."
If CGW's is swamped, the wait could be unbearable, having another to shoot would be a plus. I'd consider buying a completed pistol.
Good Luck