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I think 8" is wide enough to race, your track plan looks good.
I used a 4x8 sheet of particle board, not the rough stuff this sheet was very smooth (and cheap$10).I put 1x4's around the outside edge(the cars will NOT leave the track area) primed everything then painted the surface with a flat charcoal colored paint (looks like asphalt) and I mixed some traction grit into the paint, rolled the paint on with a small smooth foam roller.The surface is smooth and has good traction.The 1x4 border boards are painted dark green with the top edge painted yellow as an aid to see the edge.My track rests on a 6 foot folding table.
I use three sets of zipzap race barrier sets and I can set really any track I can think of up on it (I do need a bridge section though) and still have track pieces left over.I also have three sets of the microsizer track sets and I only used one set so far but the pieces are good for a less solid barrier and little jumps if you like.
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