I have to say this is a great idea. I had seen your chimney in another post and built one for my pot. Adding it made a huge difference in the time to get to boil and the strength of the boil. Very easy to make and cheap too.
I made mine removable by adding some 1/2" SS bolts with wingnuts.
The only down side is the flaps at the top are sharp. As a result, you do need to be careful when moving it. I call mine "The finger slicer 5000."