Gday, as the title suggests, Im after some car ramp plans that I can make myself.

Basic ideas are that I want to make the platform section around 350mm high, 300mm wide (across the tyre) and 500mm long (from front of ramp to back) and approximately 1200mm long ramp section which is detachable, so the vehicle would be left on the platform in the air with no ramp.

Just not sure on actual dimensions, stability, materials etc, so any guidance would be much appreciated thanks.