Ok, some addition information is required if you expect any useful advice.
First, about how heavy where your previous versions of this robot? Second, you need some dimensions to go with the image, at least the maximum length and width to give a sense of scale. Third, you noted where the servos are attached now include the other major components like electronics, sensors, batteries, and anything else with appreciable weight. Fourth, was the previous design defective in specific areas or are you changing the frame for other reasons?