No way dude.
go to a Honda OEM parts site and look up your frame.
Then compare it to the 750 frame.
the 1100 has a split backbone and the carbs and everything are
stuffed up under there bwtween the top of the cylinders.
Real easy. Just take your tank off and look.
Best bet would be for you to maybe try to modify a two piece
Harley fat Bob tank. Still gonna require a lot of modification of the
Tank halves to get them to fit.
Then you gotta make sure theirs enough depth to actually get the
speedometer to set on there.