RT1
I have investigated this for my 54 also. The easiest method appears to be to use an earlier model door but you will lose the pushbutton handle. I have seen it done such as
http://www.heavensentconsulting.com/Bob/54_project_pics.htm but they do not seem to want to share the secret. Definately some fabrication involved to move the front window channel to the front.
If you do get it figured out let us know. I plan to retain the vent windows for now but install electric windows.
