So if I understood the recipe correctly, this is how you'd set this up?
I think that is it.
when does the pzivf1 start and stop?
IVf1 487 prod, 4-41 to 3-42.
IVf2 prod 200, 3-42 to 5-42.
But ... TOAW doesn't have a IVg, instead it uses the IVf2 as the IVg, so when we see IVf2 in TOAW, treat it as the IVg. So we can forget the above numbers and go with this:
IVf1 487 prod, 4-41 to 3-42.
IVf2, IVg e, and IVg l - prod 1,887, 3-42 to 3-43 (afterwhich the IVh's started).
i basically feathered the newly-arriving divisions either (a) into "AGC reserve" if they are optional, or into armies that I thought would most likely be in most most desperate need of reinforcement
I've been looking at some of the units histories also, as long as things were possible we should be able to go along with the designers interpretation. No need to determine just exactly where some units were attached when this scenario situation is different from the historical.
... spreading out the 1942 surge replacements so that the 1942 retooling is less abrupt ...
I might recommend monitoring how it currently works, because I don't understand the replacement system at all, but have seen some cases were it takes a long time to get replacements into units. I might worry that spreading them out thru 1942 could prevent the mid-42 build up, or hinder it. I'm currently at turn 62 (5-42) so I expect something to happen, but nothing yet.