Nothing wrong in using DMX dimmers, a basic tried & tested technology in every sense. Now doing the homebrew control on top is a brave step but then again it is much more fun than simply buying something that just works out of the box providing you enjoy the time spent playing with your kit and ironing out the gremlins. There are lots of DIY home automaters doing some very clever things although they would never become a commercial proposition nor are they intended to be. And every now and then an idea implemented in the DIY community can find its way into commercial systems at some later date.
Hats off to you for having the patience to get it all working in the way you want it to
