I'm not sure exactly how it worked other than there was a removable panel of armor glass between him and the umwashed heathen hoards who didn't want him bombing them (for some silly reason, I'm sure). Once that armor glass was gone there just wasn't much between him and all the shells that tore it up in the first place.
He liked nose, ball was alright (his secondary station), tail was a beast because it was hydraulic rather than electric, and I don't know how much time he had in the waist.
After the war they transported a bunch of aussie POWs back out of Japan. To get them home they put benches in the bomb bay, which wasn't well sealed. On the ground (in the heat) they suggested these guys put some serious clothes on rather than their shorts, but they refused. Once in the air the poor guys froze their testicles off, so apparently the crew developed some sympathy and brought them up forward a couple at a time to warm up a bit.