Eric,
That uses the Protelgram projection unit, I have the manuals on my web site:
http://www.myvintagetv.com/manuals_and_documents.htm
Don't lose any sleep over any x-rays, they are "soft" and the cabinet and projector case will block them.
I have one restored, but never modified a set to use it.
http://www.myvintagetv.com/norelco_pa2.htm
Chuck