Question: I already tried this <http://hg.orfeo-toolbox.org/OTB-Qgis-plugins/> repository and couldn't get it...

This guy seems to have it: <http://www.elance.com/samples/orfeo-toolbox-qgis/24111664/>

Answer: 
I did it following this: <http://wiki.orfeo-toolbox.org/index.php/Quantum_GIS_access_to_OTB_applications>
Figured I'd leave this answer in case someone sees it now.
It seems like they've cleaned this up since it was asked, and that old wiki doesn't link well to the current website:

<https://www.orfeo-toolbox.org/download/>

There are full installation instructions as well here <https://www.orfeo-toolbox.org/CookBook/Installation.html> where they have downloadable install scripts to run.

If you are using ubuntu, you can also do

```
sudo apt install aptitude
sudo aptitude install add-apt-repository
sudo apt-add-repository ppa:ubuntugis/ubuntugis-unstable
sudo aptitude install otb-bin otb-bin-qt python-otb

```

This was the thing that worked for me after 30 minutes of trying a full build from source.