[Akash Rastogi]

Looks good! Very similar to something I recently drew up, however I had shorter flanges and the outside driverails had the flanges facing in. It also looks like your inside rails and outside rails are different parts, if you can keep the entire chassis to two unique parts, it'll cut down a little prep time for your fabricators, it will also provide another bearing mount for that output shaft of yours. (which I would extend out and support at the end, unless your gearbox is designed with this in mind and you mount your drive wheels closer to the inside rail).

edit: I really like the electronics mount you've got.