@mkgionet
It sounds as a great game.
Concerning demolition of facilities:
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Air Base & Naval Base:
These facilities can be demolished at a cost of 4 IPC, since they are considered to consist of simple structures and supply areas.
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Industrial Complex:
An Industrial Complex is considered to consist of more complex and extensive structures with multiple production facilities.
Further more the area in which the Industrial Complex is present represents vast logistical supply lines etc.
During play testing, we tried various scenarios in both cost and procedures on how to demolish facilities.
Clearly, there had to be a major difference in not only demolishing an Air or Naval Base and an Industrial Complex - but also a difference in the process.
Simply because these facilities are different in both size and complexity.
Since we had already play tested the Underground Factory - as part of the Strategic Bombing concept - we went on to play test the suitability of Underground Factory for destruction.
Play test results showed, that the game mechanisms were functioning - and we achieved both a difference in cost as well as procedure in demolishing an Air or Naval Base compared to an Industrial Complex.
For game play reasons, it was important to keep the Demolishion rules as simple as possible - and also make it attractive to players.
The final result is now part of the Axis & Allies Global 1940 House Rules Expansion.
Thanks for your comment - I hope the above explanation is adequate:+1: