So let me get this straight: Each of those tubes will spew ignited propane at the opponent, melting them to regolith so you can score on them?
What? That's not what "Ring of Fire" means?
Oh.
Actually, I like the design, and the CAD skills are excellent. I wonder if the wheelbase is too short, in that it might affect stability in a collision by causing the robot to tip over forwards or backwards. That can be managed in other ways, but it gets tricky. Also, using the bumpers as part of the frame's structure is a good idea, especially if you use high-grade material (not regular sheathing grade). Our chassis has a roughly similar shape, and we had some problems with flexing (try lifting a front corent); be prepared to address this as well.
Very nice!