Were it me I would build something with it, but that's just me. The possibilities for customization are endless. (One wouldn't necessarily have to use the correct barrel for a non-original project. One could make it a .300 using a 40 year newer barrel- they pop up on ebay all the time- or a .303, or a .30-30, or...)
I think the man may already have designs on his project. You ever wonder what a 99 may have been if the likes of Griffin and Howe, Wundhammer or Sedgley got ahold of one?