Loft with rails in fusion using as a blend surface tool is pretty tricky.
You need way too often rails to define the result.
In all other surfacing programs this is not needed as the code is smart enough to understand how
the edge condition should be.
you can see the issue loft is positional along the edges
to get what I want I have to add a lot of extra steps making sketches trimming and such - this works just blows up the timeline
The additional issue is that besides more work - having to make 3D sketches - in those 3D sketches it is nearly
impossible to create good and consistent aka equal blend curves for the rails
On MOI for example you just select the edges to blend between and the surface fits perfectly
notice how well the edges blend
loft beveled edges.f3d.zip
loft beveled edges.f3d.zip