R/M released Harley's, but most of the Honda motorcycles were produced by Tamiya. I can't recall, but they may have released an early version say...early '80s. Fujimi also produced a GL11000.
There are a couple of diecast GL out there...I Googled and found images of them.
Recently I found a rerelease of the Yamaha XS1000 Midnight Special which I owned and rode as my primary vehicle while I lived in Montana. These kits are hard to find and prior to its rerelease, they fetched some shocking prices. Now I need to find a Windjammer front fairing and saddlebags for it.