I took a couple of pics of the cycle wings, and i'll try to explain ( in my best english) what i did.
I used 20mm pipe with a 1,6mm wall to make the brackets and a hickie to do the bending. I pressed the pipe in the vice to get a oval shape and some clearance on top of the wheel and where the wing lay on the bracket.
The pipes were then welded to a triangular plate, i replaced the 3 bolts holding the backing plate with much longer ones and bolt the bracket to that. I used a nut on the inside and outside of the plate wich allows me to set the alignment of the wing over the wheel. My brackets sit very close to the wheel in some places theres only about 5mm or less clearance between the tyre and brackets.
Hope this help