[apalrd]

You posted an image of a chassis design on Chief Delphi. The Chief Delphi community has seen many chassis designs, and helps many designers such as yourself improve their designs and methods.

It's generally frowned upon to copy a design without understanding the engineering behind it. You can understand the engineering behind it by designing, building, and testing a chassis and learning what is right and wrong, and improving it for the next design iteration. Frequently, by doing this, you will learn why they did something a specific way by not doing it on your own design and wishing you had, or finding that the solution works fine in testing and accepting it as good enough. It's perfectly fine (and highly encouraged) to use another teams design as a starting point when designing something new, but to gain anything you have to make it your own. Short of actually building and testing a physical chassis, you can ask experts and teammates for advice during the design process to iterate to a final design, before possibly building and testing the final product. Chief Delphi includes many long-term FRC members who have designed many drivetrains, and some engineers who have learned the common design pitfalls and are willing to help you.

As someone who has built and tested many sheet metal and other types of drivetrains, your design needs more torsional stiffness. This is most easily provided by adding cross bracing.