widen the back end of cb750 costom

[stuart mcmillan]

ive got a cb 750 costom and want 2 make it look much fatter at the back end .i was thinking of putting on a fireblade swingarm and back wheel mabe even change the front end 2.the bike is already well modified its got a harley tank costom made frame .i just want 2 give it some balls.the cb wheels look way 2 thin .any help in this matter would b a real bonus.