Ventral greebling/detailing can be tough. I have had to combat it quite often with my past few MOCs. In retrospect, I realize that I have turned to three key pieces (excluding the half-pin): the 1x2 hinge top; the 2x2 boat stud and the 2x2 turntable top. The latter was easy to use when the goal was to achieve something technical looking, but it can be made to look even better with additional pieces clipped on. Here are some experiments. Naturally, some of these hold better than others (and some only hold when rotated a certain way), but they should all be fine under certain circumstances.