Dave W, thanks but I was just exterpolating a few ideas, none perfectly original with me.
Some decades ago, Winchester came out with a semi auto with a fiberglass wrapped bbl, choke tubes, etc. Called the Model 59, it weighed 6 1/2 lbs and is still revered in some circles for upland hunting. With the introduction of wrapped bbls for rifles, the time may be right for some shotgun bbls made that way.
Titanium parts are the latest fad with some folks in the Designer race gun games, and the bennies of same have been known to engineers since NASA started for uses other than firearms.
All that aside, my shotguns of choice are 870s.