I am going to be a little contrary here. I always inlet the trigger guard from the front, pistol or rifle, because it is the only way I can be sure the bow is oriented the way I want relative to the triggers. Also, things are usually pretty tight at the front due the pin tab or front screw having to fit behind the ramrod hole and in front of the trigger plate. The rear extension or the grip rail of a pistol trigger guard has a little more leeway than the front, at least in my opinion for whatever that is worth. I inlet the trigger plate the same way, front to back.
Of course, I could be doing this wrong. I would be interested in how those who inlet the other way make sure the front pin tab/screw and front extension end up where they need.