It's my own opinion, but old twin shock bikes from the 1970~80's are starting to become very rare, and I hate to see folks butcher up a bike trying to make it into a "cafe racer" .
Leave it as stock as you can, it will be worth more if you do plan on selling it later. There are far too many of these bikes with their subframes and fenders chopped and cut up. It's become a big problem for finding old parts bikes when half of the bike is cut away and "bobbed".
Also if you can try to keep the oil injection system working. The bike will pollute far less, spark plugs will last longer and the engine will last longer as the oil isn't being diluted by the gasoline.