I'll answer a few emails, a PM, and a request on the Tech Board by posting the design specs and general instructions here. Good luck to those that try it, I suggest you scrounge up some SS flat stock in order to keep it looking good. Mine has been in place for close to ten years without a failure, and when adjusted right it will hold any position it's placed in. The crossover cable is retained, I've never heard of it failing anyway. All the swivel connections were done with SS bolts and nylock nuts, plus a "wave" type washer to keep tension on the moving parts.
The first pic is a rough drawing of the actuating lever and mount.

In this pic, you'll see where you have to grind/cut out parts of the long arm to clear adjacent parts. When attaching the arm, I suggest using a shop towel to catch filings when you drill the two holes for those tiny bolts. I don't recall the size but use some nylock nuts and Loctite. Mine haven't moved since installed. Push the choke slider all the way to its resting point(unengaged), then make certain the lever and linkage is also at full unengaged position, then drill the holes in the slider. You should drill the long arm holes first, then place everything where described and mark/drill the slider.

To mount the lever with the "L" shaped piece, you need to refer to the link below. Refer to item #10, the rod that holds the carbs together, you want the outer rod. Loosen the nut at the end near the radiator, don't remove it...you'll drop it and never find it(don't ask). Loosen enough to tap that rod rearward to give space under the nut on the other end for the "L" shape bracket. After mounting the bracket, tighten the nuts and use some blue Loctite on both ends. Again....mine hasn't moved since installed. You're on your own re. the black knob, not sure where I got mine but most likely from one of many junk boxes in the shop. I just used 1/4" bolts throughout except where the long arm fastened to the choke slider, those are quite small....your choice. When assembled, you can adjust the tension on the nuts so the leverage stays put. You may have to adjust the crossover cable so it will move properly, I didn't have to but not all bikes are quite the same. Good luck, don't be afraid to ask questions.
http://www.valkyrieriders.com/shoptalk/GL1/gl20.jpg