that was a velocity stack i would guess. the thing with making air box mods is there is alot to it and to make it run right you would be making adjustments to the carbs all the time. i have the alum. type that kind of flows with the engine and that is why i left it, now if i had one of those plastic types i might try something different because i think they are ugly!
rims! i am guessing you have mags on there, those have to go. i am working on getting a set of spokers for mine.
not to say you need to leave here but look at some of the other forums out there, there are some that do cafe stuff.
http://www.tonup.com is one and there are a bunch of others
remember one thing it is yours and do what you want! dont let someone put your ideas in a box.