Mysterious Huge Object

For the past few days, our CEO has been working alone on something really huge.

　　　　

It is about 4.5 metres high? Cylindrical. He has been welding for more than 20 years, but this is the first time he has welded something of this size. Gigantic, really.

　　　　

What on earth will it be？
I will later show you the finished product on this blog.