Got a few more bits drilled and cut floor plates today. Welded parts of the frame onto the underside of 2 floor plates. Ill do the other 2 monday and build the legs.
I will try get pics tomorrow.

Note: The obstacle course will have a 200mm wide see-saw ramp, it wont have any sides so the body of your robot can be wider. So if you want to be able to do the obstacle course dont make your wheels wider that 200mm appart.