I don't see screw count as an issue... it is really not that much of a difference if you have to screw 4 screws instead of 8 to access the diffs. And besides, you could mod the top decks (cut them under the shock tower bulkhead) on a 501 so you could access the diff by opening just 4 screws.
Accessing (removing it, changing pinion etc) the motor on a 501 is, on the other hand, not very handy. But it is fixed on the 501.
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