Looks OK and compact. Just invert the matrix pins vertically or the USB cable end above some pins connection.

Good idea in use diodes as jumpers, save some solder. smile

Cooper background fill is good for DIY, because mean less area to corrode. wink

For make in PCB shop don't matter - and some can optimize the layout before make.



Last edited by Sokol1; 03/19/16 06:31 PM.