Brian skated in the Spokane Valley, 1978, this looks like the crew. Notice the 8 foot wide, no flat half-pipe. Skateboarder magazine printed plans, right in the magazine at the time, and many of us copied them and built this exact ramp. (Click photo for larger image).
Here's Brian riding his ramp with no pads (well, he does have his safety hat on), doing a wheeler on a G & S Warp Tail 2. (Click photo for larger image).