To my jaundiced eye, that isn't a bike that some loving owner lavished a lot of time and cash on doing upgrades.
If the bike in the photos is the bike we are talking about, there are two scenarios that come to mind. The most likely is that someone started with a later model RT/LT that was in an accident and had a badly tweaked frame. Then they did a transplant to a C model frame.
The second is that somebody had a hot brick that they wanted to make legal so they could sell it. I had neighbors long ago in El Paso who had a nice little business doing just that with Hardly Fergusons.
It would be interesting to run the engine number. From the photos, I would expect it to be from an '89 or later bike.
Either way, it's a really nice looking bike.