Hi Gregory,
All device configurations are generated from Jinja templates located at jnpr/openclos/conf/junosTemplates/*.txt. Currently all these templates are specific for Junos devices.
These templates can be easily modified to generate custom device configuration. If you want to achieve it, you have to modify existing jnpr/openclos/conf/junosTemplates/*.txt files. In our next release we are planning to let any folder or zipped folder to be used as templates and generate configurations from that. Please feel free to ask any follow up questions on templates.
Thanks,
Moloy