I remember when the SY305 Iron Man lab was made by Sheng Yuan back in 2014. It was a copy of a Lego idea that never got made. I think it sold for about $25 USD, and now two years later, it's cheaper than ever at only $20.90 USD. The lab comes with 4 different Iron Man armours and Tony Stark minifigure. There are approx 503 pieces to this super heroes building set.
I like the diorama nature of this building set, but wish they had made it more modular in nature. I don't think the Lego Avengers Tower had been produced yet, so I guess they did not think about integrating the 2 sets together. It would have made a cool basement for the Tower.
Here's the listing for it.
https://www.aliexpress.com/item/SY305-Super-Heroes-Avengers-Minifigures-Iron-Man-Mark-War-Machine-Underground-Base-Station-Building-Block-Compatible/32663209114.html
