After serious consideration, Official Sun decided whether or not to bring out the "Refining Solution." This method was not taught by Burning Hillock, but rather an integration of various Immortal Device refining methods taught by Burning Hillock, devised by Official Sun. The idea was actually inspired by the automated assembly line workshops from his previous life.
At first glance, the model does resemble the Heavenly Furnace, but upon understanding the internal principles, anyone would realize that they are two completely different concepts.
Moreover, this method was indeed the only way to complete the tasks on time without sufficient Refining Immortal resources.
Official Sun named this "Refining Solution": Heavenly Craft Kiln.
He then refined three Heavenly Craft Kilns. With these four kilns, he could complete the remaining tasks on his list, excluding the Martial Fighting Immortal Machines, within half a year.