Put in HK-47 customization for HK-51 droid
Other customisations too!
Give T7 a customisation to make him look like T3-M3 (yeah, you would have to point it out, I know)
Give your Protocol Droid a customisation to make him look like G0-T0 (just because it would look mad)
Give M1-4X a customisation to make him look like a spider droid from Return or the Jedi (the ones carrying brains in jars underneath)
Give Scorpio a customisation to look like a Cylon (no reason, just didn't want her left out)