Hmm, 4-5 tap font would take up some room on top of a keezer,why not consider 2 maybe 3 taps and change over kegs when one empties or simply to drink different beers when you want a change.
As for fonts why not piss around with some PVC pipe and come up with a style that you like and then make one,Google home made fonts/ towers there are some absolute rippers to be found which will help you to decide.