I would say no. He could easily pass as another warforged, which should be sufficient, but to look human, he would need magic. From a distance of you're wearing a hat, you may be mistaken as human. People need to use common sense with these things. A disguise kit is really just a make up kit with maybe some things like fake hair you can use for a moustache and beard, a wig, and maybe some fake elf ears or teeth, and the like.