Why is the hatch so heavy? (spinoff from fabsvr6 fiberglass stuff) (again?)

[ggehrke at gmail.com (GGehrke)]

Sorry if this already made it through, but it looked like it bounced,
so here goes again:


Thinking about weight reduction -
So I'm sure some of you have taken the glass out of the hatch and
moved em around and stuff.  Why are they so damn heavy?

Is it the metal?  And would fiberglass or even CF be a feasible replacement?
Is it the glass?  And would Lexan or something be a feasible replacement?
Is it my imagination that they're such portly sons of bitches?

-Grant-