The lift strut fairings should be attached to the lift struts using hysol. Try and align them as close to streamlined as you can and then bond them in place. You'll need to make a cutout for the jury struts. As far as the lower end of the struts is concerned, most people don't use the sheetmetal fairings provided by Kitfox. Instead, they fill and fair that area using foam and hysol or other fill. One aspect to keep in mind is that when swinging the wings, you'll need to cut back the fairings when they meet at the lower end of the struts. I can't recall by how much (I haven't done mine yet) but take a look through some of the build threads (JEvens, efwd, Esser etc and you'll see what others have done.