Take a look at the following part of the sample model.cfg:
class Tank_F: Tank {
skeletonInherit = "Tank";
skeletonBones[] = {
"zasleh","otocHlaven",
"recoilHlaven", "otocHlaven",
"hatch_gunner","OtocVez",
"hatch_commander","OtocVez",
"commander_turret","OtocVez",
"commander_gun","commander_turret",
"gunnerview","otocVez"
};};
"hatch_commander" is a child bone of OtocVez (main turret), but should be a child of commander_turret.
Additionally, "gunnerview" is also a child of OtocVec (main turret), but should clearly be a child of OtocHlaven (main gun)