QuoteThrough FBX I am able to get my camera and low res model into Terragen and that all plays well.
You were able to import an FBX object?
QuoteI can't seem to figure out how to get the model to connect into the terrain shader network
You don't.
Rather you open the obj node and apply the nodes you want *inside* of the object node.
The rest of what you wrote is not necessary or good to do.
Open the object node and with the window open, insert clip files, or right click and open new nodes, then apply them in the way you want.
Be careful about applying displacement to the object. It is best that the object already be displacement in the way you want before importing. If yo are going to add displacement, then it should be micro, and the object should be high polly.
But there is no problem applying color via PFs, for coloring, I think this is most often the best way.