I am newcomer to the game (though a long term wargamer and fan of Babylon 5).
It seems to me that the Shadows and Vorlons can really be treated in two different ways - they can be treated as another 'normal' playable race or as the 'super races' that appear in the series. For the first approach their ships need to fit within the general limits of other races ships for the second approach their ships need to be substantially more powerful. Neither approach is right or wrong - just depends how individuals want to play the game.
It seems to me that the Shadows and Vorlons can really be treated in two different ways - they can be treated as another 'normal' playable race or as the 'super races' that appear in the series. For the first approach their ships need to fit within the general limits of other races ships for the second approach their ships need to be substantially more powerful. Neither approach is right or wrong - just depends how individuals want to play the game.