Dave, maybe a silly idea but could you boost the deflector's strength by resin bonding on a few layers of cheap ebay kevlar/carbon fibre fabric?
Not sure it would stick well enough Rog. I haven't tested it but I think the flat section would take a trolley jack without bending, because the curve gives it considerable strength.
I don't envisage riding up over an "obstruction" because the sump wouldn't take it. But it's a worthwhile additional barrier for deflecting general road detritus.
