I too wonder about that because I notcied the 1500 rotor covers and fender and wonder what they did to make them fit.That is fantastic. Where was the bike?
I wonder if the 1500 forks were just swapped?
Maybe some GL1100 owners think the GL1800 is butt ugly? I know I never plan to have an 1800, a good used 1500 is my goal...Looks like polishing a turd to me. All that work, he could have bought a used 1800.