My house was built with plain old drywall window casing. I'd like to add an apron to the bottom of the windows, but am not sure of a couple things. 1. Should I install apron over drywall or cut out the drywall in the base of window frame and attach to studs? 2. If so, what about metal drywall corner bead? What's the best tool to cut without damaging it?

So we're finishing our basement right now, and there are two areas on the basement that will not be finished, or in other words, will not be insulated. They are the cold storage pantry, which is just a small pantry under the porch cap, and my A/V closet, which is basically a long skinny room, about 2.5 foot by 15 foot, right behind my screen wall. The inspector said that for that A/V closet, either the exterior wall needs to be insulated, or the interior wall needs to be. Well because I'm tight on space back there, I chose to insulate the interior wall. But apparently we are also then required to use insulated doors on that A/V closet, and the cold storage pantry, since they are un-insulated areas. Ok, so my general contractor is installing doors downstairs this week. He has the two insulated doors to install, and they have weather thresholds on them, as any exterior door would. Now this is going to sound borderline too picky, but we're just not huge fans of the look of the threshold on the bottom of the door inside the house, giving it the look of an exterior door. Like it leads outside or something. I was wondering if there was a way we could do without the threshold, but instead attach a door sweep or some other weather stripping to the bottom of the door to create the seal to those areas instead. That way, the carpet could be installed to the underside of the door, and not have to step over the threshold whenever going in or out of those rooms. My contractor is installing the doors, so I would probably have to just instruct him to remove the threshold so I can install a strip later, as I could easily remove the door to install it myself. Not sure if the inspector is going to have a problem with this approach, I doubt it, but is this something I could do?