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Neil and I did ours a bit differently. On mine you will have noticed that I had a front support just behind the rear beam axel/torsion bar. I adjusted the height of that support so that the leading edge of the pan was about 1/2 inch behind the axel and at a height about the middle of the rear open face of the axel. I reasoned that that would give me good aerodynamics and would keep the wind out of the pan. I think Neil's arrangement might be a bit slicker aerodynamically, but I was concerned with attaching the pan to a movable support. Apparently Neil's approach works fine.
The cinder block ramps worked just fine, with a light car. Make sure you set them up so that the holes are vertical. They are much stronger that way. Solid blocks would be even stronger, if they were available. You will notice that driving onto the blocks, up the ramps, is a bit of a delicate operation, since there is no chock at the top. Do it very slowly and carefully. Allign the ramps carefully before you start. Note that it isn't a recommended use of cinder blocks by many ;-)
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