From what I found, the P.207-03 was designed either for the Jumo 213or the Argus Ar 413, an astonishing point
to me, as the Argus should have more than twice the power of the Jumo ! Nevertheless, that probably would mean
considerable diferences in engine size and so different fuselage sizes for those variants.
Apart from that, I'm still of the opinion, that most of those "projects" were, what we call "concepts" today, more
or less quite lax ideas about future aircraft. The P.207-02 didn't even came close to being built, if so, the final
drawings may have been something very different again.