Nice looking 10👍🏻 I just picked up a g20 and liking it, need to figure out a holster setup also, not sure I would like a chest setup. Would like something modular so it could go between pack belt (Molle) and then to hip belt once packed in

That thing looks pretty sweet.
I have an army surplus M12 holster that works pretty well as a modular setup, with Bianchi add on such as chest holster, Safariland molle adapter, Bianchi drop leg extender, etc.
Simply Rugged makes a chest harness and adapter that can adapt a belt holster, theirs or others to their chest holster, and they make fine holsters in their own right.
Just some options to think about.