That bent in the tank is to reduce fuel capacity therefore improving the power to weight ratio of the bike. I've seen that race mod on other Buells. I'm just not hardcore enough for all that.
How-To Fuel-Weight Savings:
1. Stand motorcycle upright
2. Retract/Lift SideStand into its normal riding position
3. Let go of motorcycle
4. Repeat as necessary to achieve desired results
This will NOT, however, get you the brushed finish on your new tank modification. To achieve that look, you must be travelling forward at a high rate of speed at the moment of "Let go".