I'm a rookie here, but a 3/4" barrel coupled with the late Ketland lock would add up to only 1-1/8" between the lock panels, if I'm figuring right. I know the lighter weight is attractive, but that slimness would make me nervous. I suggest drawing out your plans, with those components, and see if you are comfortable with the resulting dimensions. Your trigger choice fits the slim geometry height wise, but width wise, a swamped or tapered barrel will give you some needed beef in the breech. It sure is a fun process, isn't it - all the thinking and figuring. Even the "mistakes" are worth the engagement. R Mann