I'd like a rugged, maybe even rough looking, double rifle in handy calibers like, 30-30, 223, 7.62x39, 308, 243, 270, 30-06...you get the picture.
Some would be side by side, some would be over and under. One over-under option would be to have either a 12ga or 20ga on the bottom.
Sling swivels, rear apeture sight and forward hooded sight, furniture and hardward like a Winchester or even a milsurp mauser...no checkering (unless it proved to be needed) no pheasants on the receiver or anything like that.
One serious, hard-working, knock around two quick shot gun.