Ive had a few hatches and compared just by moving them around. It is not a noticeable difference, probably less than 5 lbs only.
I made a lightweight camaro hatch a few years ago by using lexan/speedglass to replace the heavy glass and then I gutted the inner structure of the hatch itself. I used pins under the SS spoiler to hold it down. Came out great and looked nice. Even in a heavy downpour, it did not leak one bit.
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