Actually I like the look of a Lyman or Williams gallows style peep sight on the receiver of a traditional lever action, although modern ghost ring sights like the Skinner have displaced these. Traditional lever action receivers were D&Ted for gallows style sights for several generations. In any case, a receiver mounted peep sight requires a taller front sight to prevent the rifle from shooting high, since the receiver is higher than the barrel. Does a gallows style sight look as cool as a tang mounted peep sight, well, beauty is in the eye of the beholder, and these sights are functional, if a bit fragile, and a peep sight is a major upgrade to a buck-horn or semi-buck-horn barrel mounted rear sight.
Although its not apparent in the photo, the ill fitting butt plate is probably the result of shortening the LOP, but neglecting to reshape the butt plate.
I'm not a fan of tube magazine mounted sling swivels, which without some sort of thread locker and a coat of nail polish on the mating surfaces, frequently come loose and slide around scratching the bluing. If the rifle sees hard use, the thin magazine tube can be damaged by one of these sling attachments. I'd probably D&T the bottom of the barrel band for a front swivel stud. This is a more stable method of sling attachment, which allows you to use the sling as a shooting aid in addition to a carry strap, without it affecting your POI; a 1907 sling would manage to make that rifle look even busier.