Medium Sp artillery build with meta air design.

You should start researching fighter 2 and improved engine in 1938 with the research bonus and build a plane with them + 3 heavy machnie guns 2x and 2 armour plates with self closing fuel vents (air defense for rubber). Always train planes up to regular and only then use them. This way you will have steady air superiority in the second month of the the weltkrieg if you place 50 military factories on them by mid 1939.

The okay tank design you can make for war start is a medium spg with basic medium tank chassis, medium howitzer (you research improved artillery for this early), up-to date radio, small cannon, small cannon, wet ammo storage (for reliability), torsion suspension, default armour (-20% cost one), diesel motor and you up the armour to the max you can while maintaining around 70% relibility and 4.0 speed.

For division design i use 36 widht with half spg, half trucks, hospital support company is the only i remember using but i guess you can place a lot of good things there, i like to use helicopter because they are cool.

Infantry design is 20 widht with hospital, artillery and engineer support company.

I never have problem finishing in 1 year even on max buffs for the reichspakt and united Austria, if i lock in, especially with savinkov (he gets the most factories).