The paint booth is done! I installed the missing wall yesterday and finished the last bits today.
You can see that I filter the air before blowing it out, to get rid of the overspray. The filter material again is vacuum cleaner bags.
I have a window above the spray table so that I can open the outside window for the exhaust funnel. To be able to reach that far I need to fold the spray table away. Here is my hi-tech solution for holding it in place:
Now back to aluminum. Woohoooo!