Considering you chose a 8GHz transistor, you will quickly find problems in layout as the reactance / transmission line length between ostensibly-parallel units is not negligible but indeed makes the whole thing scream at undetectable frequencies (unless you have adequate equipment to probe it).
More common is to build a distributed amplifier, which also acts to extend bandwidth, but BJTs are not good at this, for the same (above) reason. Most often they are built with FET cascodes (or vacuum tubes if you're feeling particularly old school). (Monolithic dist. amps, using FETs or PHEMTs, push into the 100s of GHz!)
Tim