As you are aware OKB Grigorov is also offering the so-called “Mammoth edition” of their injection molded M24 Chaffee. There are several PE frets and a machined brass gun barrel included in that boxing.
First off are the side skirts. You’ve noticed in my original review of the plastic parts that the skirts are represented in styrene, and that their edges are beveled to appear visually thinner. For those of us who are not satisfied a fret numbered P72017 offers replacement side skirts complete with fastener detail.