I just checked out the build and plan in the august 54 Model Airplane News, and the pictures of the finished plane show the engine side mounted with cheek cowls. The plan however, is like the one above.
After reading the build for the plane, Bob Palmer is the one that changed it to an inverted engine, and said the builder would have the option of either cheek cowls and sidemounted, or inverted. It seems the pictures were taken of Goyet's version. Palmer said the reason he changed the plan to inverted is that he like that on his Smoothie. He also said it flew well but did tighter insides than outsides because of the wing being above the CG.