Lukas I looked at those tanks and also the F650GS tanks. Tempting but I think it would end up square peg/round hole. I would love to use a stock BMW tank since they are already set up for FI and just think of the welding saved
But in the end, I think doing it from scratch will allow the most flexibility and volume. My whole tank subframe unit including the tail light and blinkers weighs under 10 lbs on the CBR.
Although...I just pulled up a pic of the BMW, it looks like the tank follows a similar line and also has the cut out for the shock...hmmmmm
Looks like I could then use the rear fairing, seat etc from the BMW. Warrants further investigation for sure, they are fairly inexpensive on ebay
The F650 looks way too forward