Jon - the hardware locations for both styles already exist on the truck, "blanked" with small cover plates - details in the assembly manual Sect.1 Sheets 111-114 for barn doors, Sheets 115-119 for the clamshell ... the cable goes into a hole [with a bezel around it] on the door frame just above the latch and then into the reel assembly, which mounts inside the wall and appears to be accessible via the small inspection plate on the side wall
hope that helps some, but it looks complicated enough you really should have the manual
Bill
