A while back I posted a few pics (http://www.madbeanpedals.com/forum/index.php?topic=23172) here of the first few pedals I designed myself, in order to learn the ropes of breadboarding, modding, EAGLE layouts, etc.
I just posted a more detailed writeup on my blog in case you're interested: Designing the JANUS Overdrive (https://slackprop.wordpress.com/2016/12/12/designing-the-janus-overdrive/)
This is mostly a data science blog, but I've been posting more about DIY guitar electronics projects lately (such as transistor clustering (https://slackprop.wordpress.com/2016/01/20/transistor-clustering-for-diy-guitar-effects/) for phaser matching and rehabbing an old amp (https://slackprop.wordpress.com/2014/12/30/rebuilding-a-vintage-tube-amplifier/)).
Thanks and enjoy!
Nice posts... I like the phaser one especially :)