I've added in the central cut in the original board, in case there turns out to be a need for it, as well as put all of the wiring on one side of the board. I've done my best to keep the tracks as spaced out as possible, though in some places it gets a little crowded. I also changed the distances between throughholes for capacitors, as upon further inspection I found the pins to be about 6mm apart instead of the standard 4mm; I've made the spacing 7mm to allow for some extra "breathing room", amd am thinking about adding an extra .5mm onto the resistor and Zener spacing for the next revision. Feel free to contact me with any concerns, questions, etc.