WITPs construction model (as I understand it) for ships allows you to speed up the construction of one class of ship (or maybe even individual ships?) at the expense of all the others.
So - as the IJN (USN will probably still have plenty of everything), which would you give top priority to?
Cvs and BBs are a little too expensive for what you get in my book. Especially since IJN CVs have a shelf life pre-corsairs anyway. BBs just aren't effective enough in current combat routines, while IJN DDs seem to be the deadliest weapons - VERY fast, some with radar, and all with lots of deadly long lances that can ruin any USN admiral's day.
However rather than speed up the production of DDs, I'd actually build more transports to keep the Empire fed and fuelled!






