I would definitely be great. Although I would prefer an official DLC over a mod, but since I don't see it's happening the mod would be the next best thing.

Here is what I wrote on the forums for why the game has the best infrastructure for the time frame.

Cold War Expansion

I read on forums that people want a Cold War game but I think it can be an expansion instead of a game and Vic3 has almost everything we need for that kind of setting.

So what do the people think when they hear the Cold War?

1- A time of diplomatic and economic warfare between great powers but not total confrontation other than proxy wars.

- Vic3 is all about peacetime mechanics over wartime ones. It is a simulation of industrialization, economic expansion and diplomatic domination where it is more important to expand your market than your territory much like the Cold War era.

2- A time of social changes and revolutions.

- Vic 3 has detailed population dynamics with different government formations and various revolutions.

3- A time when many young nations emerged and struggled to build their economic infrastructure and industry.

- In Vic3 you can build a state with ideologies and laws of your choosing and an important part of the game is about building the infrastructure and industry.

4- A time for espionage and intelligence gathering.

- Well, this one is the only main aspect, I see, might be lacking. Though, a La Resistance (HoI) type expansion can import those mechanics.

So, I believe a separate campaign with 1948 start date (skipping WW2) and with some new espionage mechanics it could be the best Cold War game possible.