Greenelf1967:
Thanks for the comments. I use HP Premium Choice Laser paper for all my builds. The heaviest that I can get locally is 32lb/120g. After one of my first builds (Paper-Replika's Kriss Super V) resulted in a lot of waviness, I now back up the larger flat areas with 0.5mm board. The board I use is left-over comic backing board, I have a supply left from my comic collecting days.
Lee