Why would the company hiring you put carpenter as your job profession. If they are doing this cos of visa restraints or constraints guess it would be tough to get it changed later as there is no guarantee that those things would change. And, though am not sure, but being a carpenter written on your visa you may have many disadvantages...no visa on arrival in UAE (may be even GCC) and may be no driving licence here. I have just thrown in a few apprehensions...hope someone knowledgeable can inform better.