How do I customize the trisoftdita framework for Oxygen?

Hi,

I want to create some custom CSS and Schematron rules for users of Tridion Authoring Bridge in Oxygen desktop editor.

I tried to create a custom framework by extending the Document Type named Tridion Docs DITA  in Oxygen but the Extend option is greyed out.

I wonder instead if I should just be editing the CSS files (and add Schematron files) on the TD server and have them sync over to the tridsoftdita framework in C:\Program Files\Oxygen XML Editor 23\frameworks?

Has anyone else successfully customized the tridsoftdita framework so that all Tridion Docs users can avail of those customization?

Any advice appreciated,

Regards,

Ann

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