Phil,
Your product looks like it is a well thought out solution for those of us in the market for flip up rear quarter windows. I am definately going to be a buyer of one of the options now on the market or soon to be released.
Can you share any more details on how the hinge is attached to the truck. Also what is the thickness of the Aluminium you are using.
I don't know if this would add significant expense to the design, but having struts that could be easily disconnected in the event you want to open the window more than the struts allow and get them out of the way, would give us the best of both worlds. Your simple manual rod for when struts would be,annoying/in the way and struts for when you want to just flip the latch and have the window stay open.
Also, would you consider offering your panels already powdercoated?