I did some upgrading on a Marantz CD63-mk2 Ken Ishiwata Signature.
The Marantz CD63 is a very easy player to upgrade. No doubt my friend is extremely happy indeed with the Burson discrete opamp upgrades, taking his player to a whole new level.
So, attached are some photos of the CD63 mk2 KI Signature. Notice the copper chassis of the player and the toroidal transformer in the player!