Nuts! - like all Two Hour rules, is a small scale skirmish set, you'll struggle with more than a platoon of figures. That being said if they are anything like FNG, they're great fun. I haven't got Nuts! (
), but I do have FNG, which shares many of the same rules, so I'm told.
Some people don't like the 'reaction rules', which are the core of the game, as they remove the 'God' aspect from the player and not letting his troops always do what he wants them to do. I think the reaction tests make it the game it is, personally.
There isn't an SCW version, but I don't see that there are any concrete changes you'd need to make to the rules themselves.
You can download the bare bones of the system '
Chain Reaction' for free, so you can try before you buy.