Options for RC30 gas tank (F2 tank, etc)?

[billyb]

I'm picking up an RC30 and will be doing some track days on it. Have race bodywork but no spare tank, and the tank on it is nice so I don't really want to screw it up should something happen. Has anyone fit a different tank, maybe from a CBR or whatever? I don't want it to look totally goofy but I'd like to find a way to get a different tank on it so I can worry less about gravity rearing its ugly head.