Seat and fender options ending with a question

[mainlinecoffee]

So I am in the process of making new fender struts to accomidate a rear fender that was old stock collecting rust and dust in the back of a Harley shop I like to loaf around at. The fender is the same width as stock but is too long so I am going to cut and roll the metal to shorten it. I was wondering though because the original fender struts were cut aprox four inches behind the shock mounts can I just stick a couple steel rods in the frame tubes and bracket them down? Also by the end of it I intend to throw on a 70s era jap king and queen seat,one of those big cushy duel level ones with a sissy bar to attach a gas can and a gun rack/flag pole,has anyone ever tried the k&q seat on a gz before? I did some poking around but couldn't find any info...thanks for reading and any brain jarring questions or helpful tips are greatly appreciated.