I finally got the chance to redraw the circuit using KiCad.

I got some seed money from SupplyFrame (thanks!) and that means I am obliged to make the design open. ;)

This is the final circuit for the project:

http://www.afdhalatifftan.com/2017/06/low-cost-active-battery-balancer.html

I had to relinquish my intention of selling it because of I am financially challenged at the moment.

Feel free to use the design, improve it and share it! :)