permissions and ownership of files - adding platform without warnings

To create new platforms I've been using Drush make first, and creating the platform in Aegir second as described here http://omega8.cc/how-to-add-custom-platform-properly-140.

To use Drush make I have had to sudo su o1.ftp before Drush make will work - trying to use drush make as any other user has been giving me warnings that say something like "drush command could not be found" and "drupal installation directory could not be found. Drush make as user o1.ftp works.

Migrating sites to a new platform built this way works, but there's a warning message for each site that gets migrated: "Could not change permissions of /data/disk/o1/static/basefinal3/sites/all to 751 (chmod to 751 failed on /data/disk/o1/static/basefinal3/sites/all)".

If I chown -R o1 theplatformname while chmod-ing the platform and sites directories (before adding it to Aegir) I don't get those warnings when migrating sites to that new platform. This step doesn't fix anything (nothing's broken) but it does make the warnings go away, which seems much more proper. I can't chown it as o1.ftp, only as root.

I wonder if this new step in my process should be added to the documentation ...or maybe there's something wrong in my system?

Anyways, Thanks for the amazing BOA!