Tim:
I do not like using cardboard in the seat back as it warps with humidity.
Instead, I used 1/16 inch thick vinyl that I procured from a sign shop - I
think the stuff I got was from a discarded sign. This material is stable,
can easily be worked using a heat gun and never warps. You can make it even
classier by applying a thin sheet of foam to the surface of the vinyl over
which the seatback material fits. I also applied duct-tape over the rivets
used to hold the vinyl sheet to the frame. This prevents the rivet dimples
from being visible through the seatback material.
Best luck.
Wayne
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