[John McM]

When you are disassembled down to the short block it's not that difficult to go a bit further and split the case. Assuming it's just a reseal the gasket kit is not that expensive and the rest is labour.

What no one can answer is whether you are opening a can of expensive worms in doing so. If the goal is to understand what the condition of parts inside the case is, then what do you plan on doing with the answers? If the wallet is relatively closed and there are no symptoms/signs of issues then I'd leave it alone.