I recently got into Axis and Allies Miniatures a few months ago, and had a look at some of the custom cards. After about a week or two, I managed to find enough details on the M1 Abrams to make a card for it. I'm planning on making vehicles of several different factions of the 1990s. Help with point costs would be appreciated.
Since you won't be playing against the typical AAM WWII tanks I would scale everything back so the costs and numbers of dice won't get ridiculous. What you are proposing is absolutely doable in another theater of war.
When you go home, tell them of us and say, For your tomorrows these gave their today. ~J.M. Edmonds
I planned on 20 dice being 600mm, the highest typically found in 80s technology, for penetration and armor. The reason I have it high is so that players could make scenarios involving modern units going against ww2 ones, such as T-34s in the Angolan Civil War, or the M4 in the Gulf War