JP:
I can’t see why not!
If you want a bigger keg box, just slide the fridge unit to the right (as looking from behind the bar) to allow another 16 inches for a second keg.
You might want to increase the size of the PVC cold air pass thru to the tower to accomodate 2 lines.
I recommend placing any CO2 tanks outside of the keg box to reduce the chance of damaging the regulator during keg changeout.
The CO2 tank should be strapped down securely to avoid having it tip over, then snap the neck off creating a 1000psi torpedo!
Keep in mind, the Keg Box concept can be added to any existing Easy Bar Plan Design.