Here's an image of a turboprop business aircraft, the aerodynamic Piaggio P180 Avanti II.
In 1986 Flight reported that the aircraft received Italian certification, paving the way for firm orders.
Flight also featured the aircraft at its development stage allowing Flight's cutaway illustrators to get beneath its skin. Here's the aircraft's general arrangement and aircraft profile as it appeared in our archive.
...and the cutaway as it appeared across two pages: first page showing the nose and part of the fuselage of the P180 Avanti and the second page showing the tail.