Keep in mind that BP are ground dwellers not arboreal or semi-arboreal snakes therefore they do fine in low profile enclosures so 6 inches is fine, I have 3000/4000 females in tubs that low.
Air holes will depends on how many you will need don't put too many to start with, put a few, setup the tub like (proper temps water dish inside etc) and get a humidity reading.
Based on that reading you may need to had more holes.
As far as airing the tubs I usually melt the holes outside and leave the tubs out for about 30 min.
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