The setup was very easy, although unfortunately a thread was somehow postponed and therefore a bolt could not be purely rotated. A bolt from the old scratching post then work, though now at this link a clear weakness of the tree. By ceiling mount but ists no problem ...
I have found no bad smell, looks completely odorless for me.
The hammocks are calculated in my opinion for very small cats ... Our big hangover bring just his thick rump pure, nothing more ... And our little (!) Cat has just space, but small it should not be ...
Conclusion: Beautiful tree for small cats :-)