if(
    (cmds.floatFieldGrp("fieldStandLength", q=True, value=True)[0] > 0.0) and
    (cmds.floatFieldGrp("fieldStandWidth", q=True, value=True)[0] > 0.0) and
    (cmds.floatFieldGrp("fieldStandHeight", q=True, value=True)[0] > 0.0) and
    (cmds.floatFieldGrp("fieldWallThickness", q=True, value=True)[0] > 0.0)
    )