I think all you need to know is what voltage(220/110) and current goes in and what voltages and currents comes out to go to the different components.
If you want to make a new circuit or something by looking at the wiring diagram then what good would that be? it would turn out to be the same thing, just probably without a box.
BTW, making a power supply is usually a project of basic electrical engineering courses in many Pakistani universities. Maybe you should contact a student to get some help.