Cannot loft using guide rail even though it DOES intersect all profiles
I almost got it to Loft. As Dave rightly observed, the White points I decried weren't Sketch Element End Points.
That said, I did find detached points in the center profile, which included an errant Point amid a pile of Line/Arc(?) ends. First, I Broke all the Projection Links. This allowed me to clearly see that the two outside Profiles were being defined on 2 sides by the Edge of an Auto Projected Body created- I think -when the Sketch was created on a Face. Using those phantoms as guide, I connected the Arcs with Lines. The resulting Profiles would almost Loft- with complaints of self intersection. I thought it might not like the Rail Arc being virtually parallel with the Profile at the point of contact- but then I found the central Profile wasn't actually connected to the Rail- though that might be display anomaly. Check it out:
Finally got it- there was a complaint about closely co-located surfaces, but was able to resolve it by Lofting each side to center, one at a time. All I ended up needing to do was Intersect Project the Rail to the Center Profile, draw a new Line from the bottom corner to the Projected Point, and use a Spline to create the curve as the existing Arc was short of the Rail. I then added a straight Rail across the back to keep the Loft from budging out, and- hey-presto! -it worked.
Arcs are definitely not the way to go, though- check out the surface continuity at the outsides -it just ain't clean. Compare that to the perfect transition Michał achieved using Splines.
