I also have one and was somewhat dismayed when I took the gearbox sprocket cover off for a chain and sprocket change. The sump is open behind the sprocket cover and all the oil pissed out. Had gb sprocket covers off a number of (jap) bikes over the years and have never seen this. From an engineering design perspective I'd say that is bad.
Mind you it goes well and makes a lovely noise. Also looks quite pretty too.