All I did to mine was add a $3.00 Army suplus sling. It was a former State Trooper Mossberg 500 with wood furniture. It has a 20 inch barrel and 8 round capacity. The only reason I added the sling was because it already had swivels and looked naked without a sling. I doubt anything else would add to its functional capaility for my purposes (home defense).
It leans neatly on the wall next to the headpost of my bed. There is a very business-like look about it.
In the event you plan to tote it for miles, I can see doing things to lighten the gun up. I personally have never understood the need for heat shields on a domestic type shotgun. The forearm has always kept it cool enuff (temp. wise) for me, and the gun will cool while reloading.