One thing I changed that added some weight....There are a bunch of sections where the instructions start with "laminate the 2 1/8" light ply formers together" .... I swapped those out for Midwest 1/4" ply.

Why?
- because no matter how much weight I used to flatten out that 1/8" lite ply... two warped piece of laminated ply = 1 warped former. I had no luck flattening these out.
- even laminated...the lite ply was super flexible... I didn't trust it for things like my engine mount area.

So, the 1/4" ply was flatter and heavier than the 2 pieces of light ply.. but it seemed stronger too... We'll see if it makes a difference... probably not.

oh, btw.... 1/8" light ply is actually 3/32" thick in this kit... so I had to account for the changes in thickness here as well