To be clear, Deadpool is a psychopath, he just doesn’t always look quite so clearly like he is one.
Of course, with the eyes behind the Friday the 13th hockey mask, or whatever it is that’s being used to cover Wade Wilson’s face, Deadpool looks a bit more like a psychopath here than he traditionally does.
In his interview with comicbook.com, he says that the suit would have evolved by the end of the film into something more traditional.
As far as the “self-made” thing goes, the look certainly works.