I'm having trouble with the steps around the 1 hour mark, specifically regarding moving the end points in and out along the curve. I feel like my point normals are oriented incorrectly, but am at a loss as to how to fix this, or why they are incorrect in the first place (I followed the steps earlier to the letter; did I miss something?) I made several attempts at multiplying or adding to the normals in the VOP network, but nothing gave me the desired results.

I know my Point VOP is operating correctly, as I dropped it into the downloaded scene files to test it.
Forgive me if I'm completely off here, still learning, but what I'm assuming is that the normal is aligned to the up vector of the point at those end CVs, so they're just moving along the local Y-axis. I tried rotating the end Path CVs in a later save (not uploaded), which had some success but only if I also scaled the points to 0 (specifically in the Z-axis), which I feel is a messy and incorrect solution, particularly since it doesn't match the downloaded scene files and I am concerned that will affect behavior further down the line.

Any help would be much appreciated. For now, I will continue with the rotate/scale solution and hope that works for now.

And I just discovered that as suspected, the rotation/scale adjustment didn't work. It was functional for pushing the points OUT, but when trying to bring them back in, it didn't give me what I needed at all. Gah.