I'll need to do the same thing, but in Phuket, as I need to do the Sandbox. I'm going to try and get a tourist visa online to give me more flexiblity, but not sure if I can from Ecuador.
One or the other, not both. It's my understanding, you can use the money in the bank throughout the year, but need to have 800,000 baht in the bank again, three months before you renew. You must also check in with immigration every 90 days. I'm no expert and not yet living there, but that what was explained to me.