That's great to hear there's plan for a transition car. I don't think I'm on the email list (I'm not sure if these were responses to personal inquiries)
If I understand this thread correctly, the transition add on would be a Superliner II and not the ATSF El Capitan transition correct?
If the IIs were to be made, would they be produced concurrently with the Is? Ideally, I'd like a random assortment of Is and IIs as they are in real life. If they're not, I'll probably end up buying a whole train of Is plus the transition.