31 gas tank baffle repair

[fundytides]

Some of the baffles are loose and rusted in my 31 Roadster gas tank. Looking for advice on the best way to open the tank. It looks to me like the top is crimped on. What's the best way to remove and reinstall the top without running the risk of creating leaks? I assume the damaged baffles will be easy to make up and spot weld into place. I would appreciate hearing from anyone who has gone through this process.