divide attack and defence values by 2.
Converts from D12 to D6 or half.
There is more variety available for the 12 sided dice.
3 is 1.5 on a D6 so you may need to fudge the numbers a bit
Build cost in 1940 is all at once so 5/5/5/5= 20IPC rather than 4 turns each @$5
In case they dont add the 1940 rules at the end. Not all have this included anymore.