Thinking of adding a troop/ship building formula to help you guys work out how quickly it should take to build up your forces.

I'd have to vaguely create unit types though, but here's what I was thinking

Ships:

Light ships = 1 lumber
Medium ships = 2 lumber
Heavy ships = 3 lumber + 1 iron

Must have the resources available, either owned or imported. So one lumber import = 1 source, 1 lumber owned in your province = 1 source. 

Resources available / Resources required + Food Sources + Resources Exported to Other Players x 4 (4 weeks) = Amount of stuff you can build in 4 weeks. 

So here's an example: 

Player has 3 lumber, 2 iron. 

3 + 2 = 5. 

Heavy ships = 3 lumber + 1 iron

3 + 1 = 4

5 divided by 4 = 1.25

Player has access to one food source, so 1.25 + 1 = 2.25

Player is exporting 2 goods to other players, so + 2 = 4.25

X Four Weeks, so 4.25 x 4

17 Heavy Ships built in 4 weeks. Which is four real days.

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Moving onto infantry.

Skirmishers/Light Infantry = 1 Bronze
Line Infantry/Heavy Infantry = 1 Iron
Archers = 1 Lumber

Same formula, one slight change

Resources available / Resources required + Food Sources + Resources Exported to Other Players x 4 (4 weeks) x 100 (Infantry Modifier) = Amount of stuff you can build in 4 weeks. 

So here's an example: 

Player has 1 lumber, 1 iron. 

1 + 1 = 2

Archers/Line infantry = 1 lumber and 1 iron

1 + 1 = 2

2 divided by 2 = 1

Player has access to one food source, so 1 + 1 = 2

Player is exporting 2 goods to other players, so + 2 = 4

X Four Weeks, so 4 x 4 = 16

X Infantry modifier, so 100 x 16 = 1600 Archers, and 1600 Line Infantry 

Then, to stop things from getting out of hand, I would limit 10,000 professional troops to 1 food source. If you lose the food source with the army still active, there are severe consequences. 

Thoughts? This is all just hish-hash i'm playing with.

Edit: I imagine I'd make the 'ships' export worth three lumber when it comes to ship building. This would give Island nations an advantage, which makes sense, and allow land countries to go into the sea without having to take over a province with access to the ships export.