Heres a parts boom for your CTL80. I have never dealt with the conversion of a pilot machine, and looking through both that manual and my Cat parts manual I don't see specifics on the conversion but would only assume you simply need to redo your hydraulic lines. The only thing I would wonder about is the drive side. The loader side seems like it would work fine just moving the lines around but the drive side now needs to send power to both drive motors with the stick forward versus just one motor. For whatever reason in my head I feel like there may be something more than just re routing the lines for the drive side but I could be wrong. IIRC Cat charges a couple thousand to convert a machine later on so there must be a few parts and hours involved. Then again they charged 1400 for a pattern changer for awhile and all it included was a $20 switch and 30 minutes of a techs time to activate it in the computer.

 http://www.rigginsne.com/documents/upload/CTL%2060-70-80%20Parts%20Book%20Part%201.pdf