Hi there,
To my surprise, 3 layered plates weights closely the same as solid ones. This is like 30'ish version of the wings, happens to be the best I come up so far having in mind that Defender has lots of wings displayed at weird angles, so not Tie Fighter/Interceptor 'looking at the one side' way :)
Is for the mining wheel, I was browsing different 'engines' around LDD to use instead TIE Fighter original one as it wasn't ok for Defender - and this one was the best :) (this time only 9 engines happened before this one).