You are going to have to smoke much longer than one hour. You are looking at least four hours. When I smoke salt, unless I'm using all the racks for salt, I will plan to smoke something else with it; such as cheese, nuts, or vegetables such as jalapenos, tomatoes etc.
If I'm smoking it with something else, then I will have to consider what else is in the smoker. If it is cheese I will cold smoke, keeping the cabinet under 80°F. If it is only salt, or if I'm smoke/cooking some other foods, since salt is a mineral, basically a rock; the temperature is not crucial. I find I get better results using a cabinet temperature of 225°F, and keeping the salt moist.
I would recommend going with the heavier flavor woods. I have never achieved the strong smoke flavor you get from commercial salts.
Around this time of year I start making my infused salts. Some I smoke, but most I don't. Herb infused salts smoke really good, you just have to be careful of the temperature so you don't burn the herbs. Liquid infused salts are great to make. There is no basic formula, but I generally will use 2 parts Diamond Crystal salt, to 1 part liquid - such as vinegar, hot sauce, soy sauce etc.. After trying a few batches you can adjust the liquids to either more or less to your liking. Stir until well combined. The stirring takes awhile to toughly combine the ingredients. Again during smoking and or drying, you must be careful not to burn the ingredients. I always remove them from the heat while a little damp, and let them finish by air drying at room temperature. Whatever type of salt you are making, you need to stir frequently during the drying.