The Compiling PySide for IDA Pro on Windows page provides very useful instructions. However, as we tried to compile PySide following these instructions, we had to make a few changes to the packaging, shiboken, and PySide repositories to make the PySide plugging compile properly.
First you will notice that the build.py script under packaging/setuptools automatically removes the modules directory. This behavior prevents us to apply the initial patch correctly. We broke down this patchset by repository: our new patches can be applied to each repository/module individually.
We also made two small changes to the shiboken patch and PySide patch to successfully compile the PySide module. The resulting installer under packaging\setuptools\dist should work properly.
The 5 corresponding patches are available bellow: