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for the 2" bung that should be enough i would think(its easier to drill more holes than it is to fill them in) as for the coal basket i would give at least 2" and you really ought to think about an ash catcher of some sort i have a 16" dia cake/pizza pan w/2" walls to catch ashes for about $8 from my workplace (a restaurant supply company)
good luck with the builds
good evening, so I was building my fire basket tonight and I have a question. I am using an old bed frame for its angle iron does anyone know if this is safe to use? I attempted goggle fu with no luck.