First time poster here so be gentle.. It doesn't appear that the blueprints in the video are completely accurate. As an example. one of the triangular footers already poured has bolts for 4 supports but the blueprint only shows 3. In this case it's easy to tell that it's L7R that is missing. Same thing with L3R, a footer in the blueprint shows 2 support but the footer already poured has 3. There's at least one other support after the 2nd loop that only has 1 of 2 (or more) footers on the blueprint. Also, the track layout doesn't make sense at times, especially the final helix. I would expect that the footers would all be inside the helix on an invert but some are inside, some outside.