Playing around with an old PC power supply. 

Great that you are having fun doing these. I also did modify an old PSU to work almost the exact same way, however with an added Fuse on those wires, Power button, Buckboost converter with additional Potentiometer to have a variable voltage between 1-12V and installed 2 banana socket for two 12V lines each. I get around 15A from the both 12V lines, which is good for powering automotive electronics. Bought another old PSU for like 15eur, gonna mod it into a bench power supply too. Its fun doing these things.