Here is what Andy told me:
"The Mini-PAC was originally designed as a product for OEM builders of control panels and cabinets, but there is no reason not to use it. Many people building just one cabinet are prepared to put in the time hand-wiring the controls, which does give a neater final result, but if building 20 cabinets this can get a bit time-consuming!
So the choice is yours really, the Mini-PAC is more convenient, and smaller."