I also had the idea to add a cargo retainer to my attic rack, so I did it. Yes. I'll use more clamps to attach the rack to the angle iron. No its not a perfectly crafted cage. Yes. I'm proud of my low budget rack.
View attachment 1117440 View attachment 1117442
The angle iron is just some cross braces I removed from an old bed frame. I drilled 6 mm holes though, to bolt the angle iron where the grab handle had been. I stacked some nuts to make stand offs so the angle iron cleared the rear speakers.
View attachment 1117448 I clamped the angle iron for the top rail in a vice, so I could twist the front of it. That way the vertical angle iron was actually vertical. I trimmed the top end of the long (hypotenuse) angle iron, so I could fold it over the top angle iron. I bolted the angle iron triangle together with 1/4" grade 5 hardware.
I think there is a fair chance that a major impact will tear the rack out of the (4) 6mm bolts that used to hold the grab handles in place; but I think the cage will hold together. The cage does not fit over the rear seats, so it will save me a headache at least once.