Because i've allready built one. If it works for other guys it should also work for me i guess. I'm only using it for programming the cdi so i want to keep this inexpensive.

When checking hardware in picprog4u i get 12,7V at pin 4, and 5,5V at pin 12 and 13.
I've used the 100uf capacitor. I'll try the 470uf like in the 2.3 version.