Jexy is a very on and off poster. I don't know tha you'll get a quick response.

I didn't think I had seen a recent post from him. I was hoping that Water Warrior could shed some light on it, since it sounded like he had some experience.

"Does that flex at all when you lean back on it? If so, how do keep it from scratching the tail paint?"
actualy when i lean back the support doesnt flex becausy my weight.
the pain was scrached already because the passenger seat.
i put some rubber on the bolts under the iron so its cant brake the fender.

.....and there is a post the very next day. HAHAHA.

Looks like I missed some of the finer points. The plate mounts to the bike using the bracket for the front of the passenger seat. At the rear it mounts using the factory bolt hole for the rear of the pass seat. The rear 1 1/2 or 2 inches of plate is bent over/down about 22 degress to match the slope of the fender. I used the top of a pizza box for fabricating a template(needed 2 pizzas)and doubled checked all my measurements to match the bike and mounting plate that the top case used. Next part was the easiest. Found a metal fab shop and asked the boss to duplicate my pizza box template with 1/8 inch plate. He rounded the corners very nicely for me and the measurements were correct. Drilled 3 holes in the plate to mount it on the bike. I did use extra washers to lift the steel plate a little higher to clear the rear fender and prevent marks. Determined where to drill to mount the top case mounting plate on the steel plate and then double checked my measurements. Drilled the holes and mounted up the whole affair. Looked good and was satisfied with the results. Disassembled everything and sprayed the steel plate with 2 coats of black paint. Reassembled everything for a job well done.
Hope this makes things a little more clear. Any questions or comments will be welcome.

Yes, this does clear things up. It seems that your design is a little different that Jexy's. I was wondering why you couldn't use the rear bolt hole to give some added support against rubbing. Thanks!!