Judging by the examples of his work I got to look at and handle at the TGT/Shiloh range event just over a week ago, his work is excellent! I don't see anywhere on his website whether he actually chops frames down like you mentioned, however it's worth asking him at least. Judging by all of the other custom stuff he does, I wouldn't be surprised if he might be willing to do it. If not, Bowie Tactical has some of the best custom work like this out there.
there is a gunshop at anderson mill and 183 called heritage firearms that does some excellent work. Quite a few LE guys get their glocks chopped there.