I've always used straps rather than wangs, so my lobes are a little further apart. No pics handy, but I think I can describe it. To attach them I sew with the same thread I used for the bag. I've gone as narrow as 1/4" on the straps and still sewn them- a single row of stitching for a strap that narrow. I can just squeeze in two rows of stitch on 3/8" straps, but mostly I'm happiest with 1/2" straps. I've also used just a couple of stitches on 1/4" straps to hold them in place, then wrapped over them with artificial sinew. That looks pretty primitive while being secure and streamlined. You could do the same with your wangs.
BTW- When using straps, it pays to pre-stretch the leather that's going around the horn, rather than letting it stretch on its own and loosen after you've sewn it on.
Great looking horn, BTW!