From: Upstate New York
I think you can switch them (the blue research factories) over to the IIb also, if that's your research preference.
Quick question: will you produce the IIa? If so, from what? Do you have other factories (not listed / shown) that you will use for production per se?
Also, on a side note: your post was very clear and well organized, with sufficient detail for us to help. Wish that all posters had such clarity in their presentation.
Yes, I will definitely produce the IIa, but I don't want to lose those nice, juicy, fully-repaired x30 Tojo research factories.
The IIc is the ultimate goal, so, once the IIa is available, I will convert those four R&D factories to the IIb, then (a bit down the road) convert those to the IIc. (I'm going to research the IIb just so I can convert my IIa production factory to the IIc without having to repair it.) That way, when all is said and done, I'll be producing the IIa in April 42 and will be well on my way to getting the IIc very early.
But, to answer your question, I will use my current Sonia production factory to actually build the IIa (and the IIc). I was originally going to build the Sonia, but as the game has gone on, I'm getting discouraged by its poor performance, so it's going to be "eighty-sixed" (as those in the restaurant business say).