Looks just like a pimple on a pumpkin.......with or without invisible mounting bolts.Thought about that too, but it's so low to the engine you just couldn't fit anything big enough in-between to add much.
A small peanut don't look to bad on the top bar though.
Actually you might want to see how I make the tank mount bolt on this disappear ;-}
This is the before shot.
Just convert the top tube, it holds plenty..... more than that peanut