Adding door to garage tilt door

My double garage workshop out back only has a tilt door, no other regular 800 (?) Door to go through. In the good weather, that's just fine, but I am thinking of the coming winter and wondering if anyone has modified one of these to include a regular door "inside" the tilt door.



Intent ... open the small door and go in and out. Keep door closed when its cold ... If I want to open the big door, the little door is part of the large tilt panel and up she goes.