Andrew, the cage is required on the Paragon and for any Bally with the transformer mounted in the head. Space Invaders has the transformer in the lower cabinet. The upgrades to the rectified board only affects the plastic housing, which can be discarded.

thanks Nino
I assumed that's how it was, just wanted to confirm as Jango needs one for his paragon.
Some one has changed the mounting position for the rectifier board on his paragon, or has replaced it with one from another machine, see photos.

Do you think you will have a cage to suit this set up Nino or would Jango need to have a custom one made?