[Arran]

This is the common "complaint" about these repro backs, the graphics are great but the material is thin, regardless of how thick the originals were. Some were on the thin side, but those sets had a separate frame to support the loop antenna so the back was really just a cover to keep fingers out. Why they could not offer them in thicker cardboard I have no idea, it's not like thicker gauge card stock is out of production? Also since they are laser cut an extra 1/32-1/16'' should not make a difference. As I mentioned given the pricing, they should be factory correct. 
Regards
Arran