The first step to building a good blacksmith workshop was to secure a reliable forge.
Rino had no problems with building a forge. He only had a problem building a stone forge that the daily quest system insisted. In fact, he also had problems with the stone quenching basin because Rino could easily build a brick cooling trough by the furnace in his wall. Hence, he decided to get these useless builds out of the way just for the sake of completing the quest.
Nobody questioned why Rino was back down in the dwarven mines when he came stomping in. Although there were no travelling restrictions for miners to go to the grand furnace room or blacksmithing workshop, nobody went there unless they needed to retrieve stored items.