Two Weeks in Thailand, Do I have enough time.?

No your not going to have enough time with those travel plans. Driving from one end of Thailand to another and also to the east coast. You will be spending half your time behind the wheel of your car. You are trying to do too much in a short time, decide what you really want and go with that. Take a train or bus if you want to save money, they run at night and you can sleep and be at your destination in the morning.