Kind of a strange exercise they are doing. Not that I can blame them, I'd be pulling it apart to see what makes it tick myself.
As a practical exercise, however, this is rather futile; they aren't going to be able to replicate the stealth technology, nor the electronics, nor the engine...or anything else important, for that matter.
What they do have, however, is a large scale model making hobby. Maybe they should contact Airfix or Revell for a licensing deal.
The best way to find weaknesses in a system is to analyze, and then to see if you can replicate it. This has been done just about forever with weapons systems. Piloting a drone will teach you about the blind spots of a drone, that's golden knowledge if you need to take them down.
If Iran is approaching this the same way they have approached "replicating" U.S. aircraft carriers then I don't think the West would have much to worry about with this. So I suppose that's the big question here, what exactly is this replicated drone—an accurate copy of at least the airframe, or a propaganda piece designed to appeal to the local populace?
Replicating an aircraft carrier versus replicating a drone is a challenge of a totally different level, never mind the practical applications. Iran is much more likely to encounter a US built drone on its territory than it is to encounter an aircraft carrier within the 12 mile zone.
Most likely it is more than you think it is and less than they would want, and its only practical uses right now are analysis of soft spots and propaganda (and that's working well by the looks of it).
They may not be able to replicate the materials used to build the aircraft. However as the article explains, they have all of China's resources at hand and China can surely build a decent turbo fan engine and the electronics are the easiest part to reverse engineer. The basic components are likely to have some production in China and all that corporate/DoD espionage gives them a leg up in mirroring whatever we design.
Material science requires far more technical and scientific expertise along with significant investment in production and the coatings and alloys are key to proper stealth but just having a capable drone will be enough to give Iran powerful reconnaissance capability even if we have the advantage in detecting their design.
As a practical exercise, however, this is rather futile; they aren't going to be able to replicate the stealth technology, nor the electronics, nor the engine...or anything else important, for that matter.
What they do have, however, is a large scale model making hobby. Maybe they should contact Airfix or Revell for a licensing deal.