A transition structure for a tower comprises a plurality of panels that each includes a panel body having opposed upper and lower ends, a lower mounting surface at the lower end, an upper mounting surface at the upper end, and a pair of lateral mounting surfaces at lateral edges. The gel cushion is flexible enough to prevent tissue damage to the user’s fingers due to repetitive motions over an extended period of use, yet firm enough to transmit the desired pressure to the control stick. A coating material is deposited on the first face which has the material removed. A corresponding fluid flow machine such as, for example, an aircraft engine.