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Thanks Marty,
It will be about 7.5" center to center, so that should be fine. The base will have 4 pieces of the tubing to support the tracks-see the red lines in the plan. So the bottom will have a total of six 1/2" pieces 14' long. Couple of mechanical engineer buddies told me they calculated it should be fine with no center support. Got a web site for those catwalks? You order them from Kidman's? Jerry
 
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