As long as you have one original that says it's for drivers license, you can use the original and a copy for the car license and the motorcycle license.
most immigration offices will not let you get the 60 day visiting Thai family extension anymore if you entered visa exempt. Since visa exempt moved to 60 days they stopped allowing it.
You are supposed to get a visa before you travel to a country. That's what embassies are for and that's how visas work. You MUST be able to show 400,000 baht in YOUR Thai bank account if you want to try and convert to a non-O visa inside of Thailand (which is a courtesy offered by immigration and is not the way it's supposed to be done). Without the bank account, you're not getting a visa.
Do it the way it is supposed to be done. Leave Thailand, apply for the non-O marriage visa from the Thai embassy where you travel to. Once you get your visa, return to Thailand and open a bank account using your visa and other required documentation (varies from bank branch to bank branch) and then immediately transfer your 400,000 baht.
The money must be in your bank account for 2 full months at the time you apply for your extension, so that means you only have 30 days from the time you enter with the visa to open your account and transfer the money. The faster you can do it, the sooner you can apply for your extension.