Yes, 1/8 is super fine for the side windows and including the back light. It can also work on the vents but an extra thick rubber gasket has to be made to compensate for the void.
What I ended up doing was using the original tracks and cranks (all lightened of course)and mounting the 1/8 to that by modifying where they sit in the tracks with a special piece of aluminum and gaskets to have them roll up and down. I'll post some pictures soon to visually explain.
The strap option is super cool to shave even more weight off especially on the A-body doors.