Stats and GrowthEach turn is a week, and it starts with deciding your tank's diet for that period. Different foods have mixtures of stuff that will affect your tanks attributes.
Food and their Relation to Attributes:
Fat = Armor
Energy = Mobility
Protein = Firepower
Minerals = Accuracy
Body Type: Heavy, Medium, Light, Others?
Body type affects skill growth through food as well as compatibility with moves. Some moves are universally compatible, other moves can only be learned by certain kinds of tanks.
Relationship Between Food and Body Types
[H]-[M]-[L]
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F P M E
For example, an [L] tank will get the most growth from mixtures of minerals and energy. They benefit slightly less from protein, and the least from fat.
Heavy tanks are more likely to be tough, slow and powerful. Light tanks will be hard to hit and always land their shots. Certain body types encourage certain builds, but with hard work you can create nimble tanks with [H]-type bodies, and so on.
BreedingWhen one tank loves another very much.. You shove them in the barn for a month (3 turns/weeks) and hopefully if they like each other enough they make a babby tank. Details about this will remain mysterious. You can use items to encourage specific outcomes. You're more likely to have the attributes of one tank if it breeds during the season it was born (we'll call this their "heat" period). You're more likely to get a fairly equal distribution if neither tank is in heat. If both are in heat, the outcome will be extremely random, but you're guaranteed massive growth in at least one stat. The best and the worst tanks are created this way.
The average babby will almost always be a combination of the best parts of their parents. This includes stats, personality, and sometimes even moves.