Several labor-intensive steps take an idea from the imagination to its finished form cast, in bronze. In addition to the traditional method of casting, Marco has also developed his own system for casting bronze, using as a guide the process used by jewelers and adapting it to accommodate the difference in the size of his pieces.

First, a latex rubber mold, protected by a plaster shell, is made of a sculpture that has been done in wax, clay, or wood. When the mold is cut in half and the original released, an exact negative impression of the original is left, which becomes the new master from whom all copies in an edition are made.

Next, hot wax is painted and poured or "slushed" into the mold, distributed evenly by gravity flow. When it has cooled, the wax is removed and small imperfections like air bubbles and seams are carefully "dressed" and removed by hand. It is at this point that the work is numbered and signed by the artist.