VoltageMan i already discussed in details the critical parameters in one of my posts... some time ago...
I just wanted to point that if the primary is in outer relation relative to the secondary the field lines of the primary (inside) cuts the secondary turns directly... while the secondary field lines connect to the primary at its outside part...
The implications of this may be of little impact..
I also wanted to point out why stans all in one vic has the chokes in the innermost shell and the secondary on the outermost cavity...
This explain why the vic was completely isolated with that much plastics
High voltage transformers has the high potential point at its inner point.