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I just got my I3 Mega 10 days ago and though I haven't taken the bottom plate off yet, I do have a few observations.
Mine is 32bit version, Anycubic refers to it a Mega 04 but mine did not come with the bed leveling sensor, so I don't think 04 do as a rule.

Quick question. If I want to upgrade the drivers, I guess my only options are to either do surface mount soldering, which I would have to "outsource" or "downgrade" to an 8-bit board, right? Is the downgrade option really a downgrade? What do I loose out on going from 32 to 8 bit? Just slower UI or anything print quality related?