Don't know if it may be useful for you, but Trovebox dealt with RAW import, you might want to see what they're doing and if you can take advantage of their work

Don't know if it may be useful for you, but Trovebox dealt with RAW import, you might want to see what they're doing and if you can take advantage of their work https://github.com/photo/frontend https://github.com/photo/frontend https://github.com/photo/frontend/issues/1400 https://github.com/photo/frontend/issues/1400