my apologies for the chinese product. i was poor, and in no condition to properly support our domestic economy. unable to pick up a quality used anvil from the trading post or whatever, i put this $25 bit on my christmas list.
so anyway, now i had some fender supports/mounts to make. the fender i'd decided on (yes, i ditched the armor-dillo!) was a thin-as-shit honda front fender, from a late '70s cb750. it was a free score, and was easy to manipulate to fit my wheel. to widen the fender / tighten the overall radius, all i had to do was pull it apart with my hands over and over across the length of it. it was very easy to manipulate, plus this stiffened it a bit from the working of it. the big drawback to a fender like this, though, is that it is prone to cracking from welding and/or vibration, and prone to crumpling if anyone sat on it. no problem, as far as passengers. and as for the weakness of the metal, i had a good solution.
first, i would mount the fender at six points, to reduce harmonic vibrations singing through it and tearing it up at the mounts.
second, instead of mounting bungs to the fender, i'd use straps to go underneath that could be bolted or riveted to the fender. the straps would come out from the side of the fender, and there i could weld bungs for mounting.