Some of the commonly-overlooked override capabilities are listed here:
database_tables.php & filenames.php
Combine your extra details for these two files into one file, and then add it to both the storefront and the admin:- /includes/extra_datafiles/my_contribution_name_datafiles.php
- /admin/includes/extra_datafiles/my_contribution_name_datafiles.php
(these will auto-load)
stylesheet.css
- includes/templates/YOUR_TEMPLATE/css/styles_my_contribution_name.css(This will auto-load)