Transfer data to storage module

I'm doing the same thing. I was experimenting with the module
https://www.drupal.org/project/eme →

With some success, but considering how few I have I may just copy paste the new entity content in the end...

1. First step recreate the fields for the field_bundle bundles in storage bundles.
2. Move the content over
3. Hook up references to the new entities
4. Copy styling and templating.

That's my plan anyway, hope it helps.

The hook up reference bit was really easy actually, because I matched ids, I just changed the config of the reference field to storage, imported it and magic happened.

thanks for the info, joel!