Doing it on 3 was hard as balls, Not only does it have to be a NG+ thing, you have to start it in "Classic difficulty' which is defaulted to hard mode, you're not allowed to craft weapons and only allowed to build weapons from preivous games with blueprints. Also changes it to 'classic aiming' and reduces inventory slots.
Sometimes I get that tick of insanity that makes me want to do these things, alongside modes like Bioshock Infinite's 1999 mode which ...
https://bioshock.fandom.com/wiki/1999_Mode yeah ...
Loved it in the end though. Not even a close mate of mine was able to surpass this.