as far as the fg, 2x2 twill weave is the easiest to get to form around complex curves. for the panels, you can actually beat the panels gently with a stiff wire brush from the gelcoat side to find the voids if you can't see them because of the bedliner. it's going to be worth it, as you stated, it would be bad to find after paint. I mentioned in an older thread that if they made fg panels for the 818, there would probably be voids and they would require the same attention as the other ffr kits when it comes to prep. not really no paint. that said, I'd still rather have the fg panels because they're easy to modify or repair.