rough opening (72") 36X4 144 + 1-1/2 (3/4" jamb trim) + 1-1/2" ( 3/4" bumper x 2) = 147" my friend

shim the bumpers

better enough out and then shim in.. otherwise ~ the doors will not slide flush and even with the jamb trim

Brian
Brian...you're correct, I forgot the jambs inside the wall.
I used to hate pocket doors.:wallbash:
Now I take the Johnson pocket door kit and throw away all the 1x2 metal clad strapping.
I just use the track and the hardware.
I substitute the strapping with 3/4" plywood on each side.
This makes for a smooth "pocket" - nothing to get caught on.
Sheetrock is easy to screw off
Wainscot and baseboard have plenty to nail to.
The "extension" jamb has plenty of nailing.
It also lets pictures get hung by the Homeowner later:thumbup: