the whole midibox hardware platform is modular.... they are all seperat modules that can be chained togehter with standart crimpable ribbon cables. if you speak of modular you might mean the Case - the housing - the 19" Rack or so > i suggest a system that has a rail for free movable screw nuts, so you can replace frontpanel and backpanel parts when you update the system.... the wireing internal i would make with ribbon cables instead of "power rails" ---- e.g.: http://www.schneidersladen.de/de/tiptop-audio-z-ears.html http://www.schneidersladen.de/de/sb-rail-1m-ohne-kante.html http://www.schneidersladen.de/de/sb-rail-19-mit-kante.html i dont have tried this products... i only say it is a good idea