Help in using flow along srf

Hello I’m relatively new to Rhino. I need some help with this “cage” I’m building around a bridge. I’ve been experimenting with flow along srf but having some trouble making it look straight. I first made a few curves for the loft command then used flow along srf, however the loft surface doesnt really come out smoothly and I have to manually move all the control points for the surface which results in a very unequal surface to flow on.

Is there any other commands I can try for a project like this?


Hi Stella - just a guess but I think, possibly, you can get at what you are after by making the overall swoopy shape, then slicing is up with parallel planes and creating the ribs from the sllices.

-Pascal