I thought the expanded foam was a bit iffy. I drilled & tapped the 20mm tube in 2 places & used c/sunk s/steel capscrews to secure front down. It is solid as a rock & looks quite good, my exterior color is carcoal so they are quite hard to see even in the grey undercoat. Phil good advise on the rear end, I ripped open my fingers getting body off once and needed stitches.
Leeroy