Sure. Don’t do it, a bull pup will not allow you to use a defensive shotgun in the most efficient manner; “stretching the gun”, to remove recoil from high brass loads, and make fast follow up shots.I'm seriously considering some sort of bullpup 12ga mag fed semi-auto. Anyone care to talk me out of one?
To stretch the gun you float the stock gently against the shoulder, pull rearward with your shooting hand, push forward on the fore end. Check out the Beretta 1301T, they are amazing and will serve you much better.
A magazine fed SG can’t be topped off by loading the tube at every opportunity.
If it’s just for play have at it, but magazine fed shotguns never made sense to me.