I have not even a clue where to start with the gauge of metal. 20ish? Maybe? I don't have a micrometer.
If you don't want to drill and tap I would deffinately use heat. Also this tool has a chance of working...
I can help with the 3rd picture.
You are missing a gas tank shield that connects to the bolt you have circled. I have mine out right now and will take a pic in the morning.
Your 2nd pic has been debated before, but I don't know the outcome.
HTH
Dave