08+ R6 Endurance Tank Build Ideas?

View attachment 168866 I’m looking for ideas on expanding an 08 R6 tank done right.
I’d like to add a gallon +|~ so the bike will go a bit farther on a fuel run.
Cutting/welding is not the issue as I can handle that.
I want it to look as professional appearing as possible.
Please post up any pictures/drawing/ideas you might have if you will.
Attached are a few of the cut lines I’ve entertained.
Thanks.