I like bullet hinges the best.
Fight the urge to weld the hinges on before cutting the door completely off. You may have to tweek it some to get it back to its original shape and hinges will make the job harder.
I like to weld a flange inside the cook chamber and use it for a seal seat. Some folks weld the flange to the door and use the cook chamber for the sealing surface. Either way is good. Get some self adhesive gasket - its terrific.