While finished weapon doesn't have any professional requirement, engineers are only profession that can wield them without too much problems. And even for them it isn't exactly easy. And since finished product is nondrop, they are also few of the professions that can actually assemble it.
Geting parts needed is no walk in the park either, but since weapon requires title 7 to equip, parts are sold in shops for low prices. But should someone wished to acquire them first-hand, he or she should bring a team. All the parts drop from ql 240+ dragons, located in Inferno (with Lord of the Void also poping up in strange places like Nascence).