No, it is the regular trainer in the never built side-by-side configuration. The project is from 1953. I have an inboard profile too, if someone is interested. And BTW the Wiki is wrong. The Mb-326A was the basic trainer with tandem seats (later than the side-by-side, 1957), the -B was a trainer and light-attack, from 1960, and the C the F-104G trainer. I'll post the individual designs. B and C were never built.
As a final note, you'll notice that the side-by-side from 1953 has 3 (three) machine guns in the nose....