Not practical for realistic use.There is something called rocket-assisted takeoff
There has never been a mock up like this before. There was a structural demonstrator, but that wasn't a mock up intended for placement atop the wuhan carrier mock up.So another mock up? Or the same mock up?
We've known for a while that their fixed wing AEW&C would basically be a fresh design, potentially based off Y-7 but it would be so highly modified that it may as well be a new aircraft.Either way the only AEW birds available right now are either old USN birds, new US Hawkeyes neither available to the PRC or Helicopters.
The Russians started work through YAK along with a cat system but it was cancelled and is now pushing 40 years old. What this means is that the PRC has to basically start with a clean sheet of paper as the YAK 44 was built for a radar, engines, avionics and equipment that would be decades out of date.
Are you talking about Yak-44 here?China is inducting a new helicopter based off a 50yr old foreign design, so I don't know why inducting a 40yr old foreign AEW design would be out of the question.
In fact, "based off a 40+ yr-old foreign design" would seem to describe most of what China currently produces.