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> No metal at all
I wonder how realistic this is. On Victoria II there are some iron RGOs in Anatolia. Perhaps Turkish Bernd can enlighten us on the mineral output of the Ottoman Empire in WWI. This is one thing that can be improved in such a mod.
> I don't envy them.
At least it's not Senussi with zero IC, zero resources, zero manpower and not even the "19th century warfare" tech researched.
> How much the default gives?
From experience I can say it gives very little, maybe nothing at all. On my last Soviet game I didn't notice any IC increase after taking over nearly all of Europe, but once I appointed a minister with a bonus for foreign IC I had a dramatic increase. On misc.txt there are the following entries:
# Resource multiplier for non-national provinces
	0.9 #0.5
# Resource multiplier for occupied provinces (overrides non-national)
	0.8 #0.4
# IC Non-National Province Multiplier
	0.2 #0.3333
# IC Non-Owned (i.e. occupied) Province Multiplier (overrides Non-National where applicable)
	0.1 #0.2

I took on an Italy 1936 game but quickly realised there's just not enough resources and money to feed even the limited industry. 
I wonder how military economics could be represented better in Hoi2/3. The resources portrayed in Hearts of Iron aren't bad, though rubber could be split off from Rare Materials and food added, but the way they're managed by the player doesn't do justice to their importance. Ingame resources are fully spent as long as industry is running. Theoretically it's possible to save resources by leaving industry idle but nobody ever does that. Yet countries in this time period had to choose how much of their resources they'd actually use and if stocks were limited they could operate their industry at less than full capacity. Maybe one more slider in the production tab should go for resource conservation i.e. leaving some industry idle, with a mandatory minimum unless certain conditions like high mobilization are met.
Both exports (which produce the "Money" resource, presumably representing gold and foreign exchange reserves) and domestic consumer goods (dissent reduction) are represented by the Consumer Goods slider, and yet a choice had to be made between them. The two should have been separate with dissent handled differently, acting in more subtle ways rather than immediate IC reduction.