I'm going to let someone else answer the other Q's for certain as I didn't even get it right... but if you didn't see this as well as this thread it might help: http://www.midibox.org/dokuwiki/doku.php?id=wilba_mb_6582_psuopte
Don't take this as gospel, but IIRC I don't think C13/C14 need jumpers, they were originally smoothing power so they're just between the power input and ground. Option E means they're now the other side of the voltage reg, so they're pointless, but them being missing doesn't interrupt the circuit. In fact, on that basis putting jumpers across them to ground would be bad.