How about some pics of the fairing?
some mount to the bars or headlight (flyscreens, bikini fairings, etc) and some mount to the frame (ducati, norton, production style fairings). The first thing to figure out is which is better for what you have. Also unless it is a large fairing most don't move the headlight.
Maier makes a number of small cafe style fairings and their handlebar mounting system is pretty sturdy. I think you can order just the mounts from them.
Dennis Kirk sells a nice set of frame clamps you can use to make some fairing mounts. You are going to want to triangulate the cross braces and use tubing instead of sheet metal - it is stronger.
BTW, for those out there still looking, don't discount 80's sport bikes as a possible source for a fairing. I saw a bunch of guys using 88-94 FZR600 front top fairings as bikini fariings. They would glass up the headlight holes, trim the bottom a little, and mount them to the handlebars (with little driving lights mountes underneath).Looked slick and those pieces are pretty cheap (I have one rotting in my attic right now).