I have updated the 3D drawing with minor adjustments that I changed or would like to have a little different. Most changes are that I fabricated the chimney out of sheet metal instead of a 60mm x 120mm square tube that I did not use (had to buy 12 meters...). But the sheet metal is better and it makes the build much easier/cheaper.
I have not taken the time to update all 2D drawings since it takes alot of time. But if anyone of you want you can have the full 3D version. You have to make 2D drawings yourself but it shouldnt be a problem. You still need to be able to know some basics in CAD to see how it should be put together.
Have fun!
AutoCAD 2014 dwg-file
https://www.dropbox.com/sh/i9y2f161czianlx/AADfJY_uqAjowL79MXp9Rv1Da?dl=0