Certain example embodiments relate to a sliding window assembly (e.g., of the type found in utility cabs or other vehicles), and methods of making the same. A slidable window panel includes at least one top pin and at least one bottom pin attached thereto. A single fixed window panel includes a hole being defined therein for receiving the slidable panel. Elongated upper and lower rails connected to the fixed panel include upper and lower rail channels defined therein for slidingly receiving the at least one top and bottom pin attached to the slidable panel. Forward and rear end details are provided to each of the upper and lower rails proximate to the hole for slidingly receiving, in respective channels formed therein, the at least one top and bottom pins. The slidable panel is laterally movable when being opened via the respective rail channels provided to the upper and lower rails. The channels in the forward and rear end details are formed so that the slidable panel is movable slightly outwardly towards the hole when the slidable window is being closed and slightly inwardly away from the hole when the slidable window is being opened.