The gridlines on the image are at 12" spacing. The U-Turn sections are 4' deep so the O-81 is 41.5" out from the center. The straight sections are long enough to support a 40" atlas bridge and leave 28" on either side. FasTrack O72 and O84 should fit into that benchwork configuration as well. The entry into the center of the layout is on the bridge side (duck-under or lift out with some clever bridge mounting.)
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