Wasn’t this about T1 Axis purchases? :-D
Germany - Carrier and 2 Transports
Japan - Minor IC and 2 Transports (although the Naval Base in Hainan is intriguing…)
Italy - Infantry and Transport
See a theme? The Axis has to create versatility and project power/tip the economic battle.
IMO the transports for Germany are to threaten Sea Lion, not to complete it. On G2, 6 land units per turn can shuck to Norway. Combined with the Finnish Infantry, Germany pretty quickly creates an overwhelming Northern front. Leningrad will fall. All mechanized forces can end up in the Baltic States on G4, with a ton of Inf/Art, and 6 more land units can be brought with the Kriegsmarine on G4 & G5 to put it over the top. Or, if Russia sends everything needed to save Leningrad, then Germany simply pivots all mech forces and the Ukraine falls. Yup. Russia, pick your poison. All set up with 2 Transports and a Carrier! Good times in the Fatherland.
G2 & G3 you’ll find a balanced purchase of inf/armor/a naval unit/an air unit will provide punch for Barbarossa.
Secondly, this G1 purchase forces Britain to honor the threat of Sea Lion, which slows them down in Africa. This is a good side benefit for Italy.