Here is my solution to the sagging shelf (only sagging near the hatch opening)
I used two pieces of aluminum (.75in flat stock for the top, and .75in L-channel on the bottom)
I used a bench vice to curve the aluminum to fit the curve of the privacy shelf (just lightly clamped and then pushed on it every 6in down the length to get it to match). I just matched the curve of the two pieces together so they fit on top of each other.
I clamped the two pieces together and drilled a pop rivet hole every 6in or so everything would align when assembled,
I then painted the top piece black so it would hide in the hatch a bit better.
finally I took the two drilled pieces of aluminum and laid it on top of the hatch cover and drilled through the privacy shelf and pop riveted it in place
I cant figure out how to get pics to upload, so here is an imgur link with 3 pics of the fix
https://imgur.com/a/ZZlIXdo