Apart from Mike Sidonio's amazing shot, not overly familiar with this one. Looks like you've done very well indeed, especially getting some of the fainter stuff. The distant face-on spiral toward top right came out well.
Regarding hundreds of 60 second subs, might be worth having a go at longer ones just for the convenience. You could also have a go at the only moderately horrible maths for working out how long an exposure would be sky limited rather than exposure limited.
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