You know I had to manually create all six sides for each cube in order to achieve the bevel effect I wanted? Pissed me right off as it took ages, Photoshop's modelling isn't as sophisticated as I first thought it was.
However the process was sped up somewhat by using the 'Instance' feature, all I needed to do was create one side, Instance it 5 times then move them into position to make the cube shape. Any changes made to the 'master' face was immediately applied to all the others.
