Roller07,

Some quick answers:

Aircraft production: in OTL aluminium production fell sharply because electric power fell. Here there is no reason why electric power is to fall before Barbarossa-42 and then the Wehrmacht is not to enter so deep so deeply in Soviet Territory. Now, you have to know that soviet industry substituted other materials to aluminium in OTL (and could have done that quite easily in FFO). On the other hand, aluminium production WAS increasing fast in 1937-1940 and would also have increased later in FFO.

Tank production: production problem with the T-34 were solved by spring 1941 and monthly rate were over 300 when Germany attacked in OTL. This is "peacetime" rate. Switching to wartime after may 42 would induce a very step increase of production. Note too a strong "learning by doing" effect. Even discounting simplification when producing T-34 at 500 unit a month the Soviet industry used 35% less time and materials than when producing the same tank at 150 unit/month. This is a clear vindication of post war K. Arrow paper "The economics of learning by doing"

We used Soviet data checked in archives and extrapolated from trends known in June 41. After that we -cautiously - simulated a Soviet Industry losing 20% of its production base (it would probably have lost less than 15%) and then increasing on a curve as step as it did in OTL AFTER THE FACTORY RE-LOCTAION PLAN HAD BEEN COMPLETED. Remeber that the fall in production we have from September 41 to late 42 is linked to the fact that most factory had to be hastily re-located and they were re-located frequently in place where electric power was in short supply. Nothing of that is to happen.

Had a look on the chaper devoted to Sovier war production"The economics of War in Soviet Union in World War II", in I. Kershaw et M. Lewin, (edits.), Stalinism and Nazism - Dictatorships in Comparison, Cambridge University Press, Cambridge, fvrier 1997, pp. 208-236. 1997.

Best regards

Fantasque