I have thougt in the same lines, so you can keep using a standard tank.
Or a bracket that would fixate the tank, just by raising the back, push into bracket at front and secure at the back.
I've seen a racingbike where the front was held by a rubberstrap, fixed to the frame and just pulled up to a bracket on the tank.
with this setup of course, you need to attach a bracket to the tank
_________________
Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom