Install the latest Cookiecutter if you haven't installed it yet:
pip install --user -U cookiecutter
Generate a custom Django app that works with the Airavata Django Portal
cookiecutter https://github.com/machristie/cookiecutter-airavata-django-app.git
Then see the README.md in the generated project folder for instructions on how to install your custom Django app into an Airavata Django Portal instance.