Just my thoughts about the barrel mount portion. But I'd not drill holes in that thin little lower rib and risk gouging the barrels with a drill point or tap. A simple base soldered on the barrels will be reversable later by simply heating and removing it and reblueing. No rib removal and replacement and re-laying ribs, etc. Besides, you'll get more soldered area than the thin line of solder joint for the lower rib. It's not such a big deal soldering on barrels.