Thanks for the suggestion. Before seeing is I found another way, which is imperfect but so far it's seemed "good enough". What I've done is replaced a section of ramp with a Bezier curve, starting as a curve between a corner of the two sections I want to join (further apart than the little gap I showed). Once the curve is spanning the gap, I use a plugin called "FollowMeAndKeep" which copies the rectangular cross-section along the curve. It's not really following the path I wanted, but with care I can make it good enough for visual purposes, which is all I need right now. I'll check out your idea and see if that can do a better job. So thanks again.