From what I can read here then Leuchter was indeed not an engineer, if there exists any credible evidence to the contrary that he really did build those things from scratch and such then fine we could call him an engineer but this question if Canada or some other country recognizes him as one or if he signed some statement to avoid prosecution and such things I do not see them as being of importance. If it can be proven that he has done what Mark claims he has then that along with the fact that he has referred to himself as en engineer should be sufficient for us to call him one.