I think we should take a break with constructing the ice roads and go back to discussing the design. I'm not very happy about how they look right now, though Idk how completed they are.
The Nether is good for efficient transport, so in The Nether we can have simple, direct routes with ice boats and fast turns. It's also a giant complex cave so the view isn't that ruined by the infrastructure near the top.
In The Overworld I think transport needs to be different and respect the terrain more, if it's built above ground. I think it would be a terrible eyesore to make straight ice boat skybridges all across the world. Those who are mostly interested in straight and narrow ice boat routes that are cheap to build and easy to follow, my suggestion is that we build them as underground tunnels.
My idea for elevated ice boat routes are that they would be a bit like the step from road to horse road, but one step further. They are wider, for example 8 blocks, so you can still turn a bit around on them without crashing. Maybe the sides have solid blocks next to the ice so you brake a bit instead of crashing directly (very annoying on any curved/diagonal ice roads). If there are terrain features like a hill, the ice roads might curve around the hill, or along a coastline, but could also tunnel through if that route is more efficient. In general they would be more direct than horse roads but still with some curves.
I think e.g. the sandstone blocks on the sides of the ice roads I've inspected match them well, but the ice roads would be more covered, also blocks next to and probably below the ice, and with periodic pylons so they don't look like they are weirdly floating.