I been thinking about an aluminum smaller tank for CB750.
Found a couple today & got the CHEAP..
Have to mod them but less work that starting from scratch.
One is Suzuki dirt bike, the other is TL 125 or 250.. Oddly enough the TL tunnel almost fits a 750 frame except for the front.
, back & petcock, would have to be changed a bit unless you maybe tried to run dohc sidecovers.. dont hold much gas though..
Man are they light, like about 4.5 lbs with gascap...
Sure would look killer , polished , & in the sun..