The smithy needs more inventory space. You can't create a mythical, legendary, or materwork shipyard in the current smithy. We had the blue prints and the mats to create it, we just didn't have enough space on the smithy to make it... So please either reduce the cost of materials, or add more inventory space in the smithy. That being said, it would be a cool thing to see that or just have resources pull out directly from a resource chest near by to do crafting.