Rune,

The picture you posted is of the later better known Skymaster with inverted RE engine and pipe on fuse top deck.

I believe Kato's first SM had a different configuration with the engine and pipe on the side as you describe. It also had a different "jet like" tail a bit like the original Yoshioka Blue Angel although the wing and stab were always double tapered (LE and TE).

There are a handful of people on the forum who have this original SM if memory serves. I believe I have seen pictures of the older plans posted. You might want to do a thread search as there are several threads on this beautiful design.

David