Enginner... sorry but I didn't really understand the first and second questions. Basically I have increased the production of raw materials because in HoI the brazilian ICs almost can't be improved without conquests (suffer early from lack of resources), and IRL during that period you can say that the industrial production praticaly doubled. And there was never a lack of raw resources (coal production must be kept rather low, though). I have increased the production of rubber/steel (and some coal, but not much) based only in qualitative measures, not quantitative things acquired from official statistics (which are difficult to find).
Basically, on those days those provinces with low infra (including the ones I lowered it), be it under 34, were really a true wilderness (and most are even today), with almost no roads, railroads and such. The main transport mean is by ship, even today, with airplane transport being more important today. But anyway, IMO those values ought to be very low (but not zero, because of the amount of rivers, thus you can 'navigate' them).
I like the idea regarding the german trade events. The trade actually included raw materials (including rubber, some foodstuffs and, IIRC, some metals) sold to Germany and bought industrial machinery from them, including railroad parts IIRC, and military stuff. I will check it further. For the infrastructure, if it has to be improved via event, should be on the industrial provinces (São Paulo, Rio de Janeiro, Curitiba, ...). But I'll check it better.
The events I wrote are, as I said, just proposals, thus they are likely to be changed or even excluded if it's the case. In some days I'll add some more, regarding the trade agreements with the USA, the historical entrance on the war, etc.