Looking good!

Welcome to the C:S modding world, by the way - the exact same situation (unmaintaned mod) was what (finally) got me publishing mods on the workshop, too.

The 'fix' is basically always returning one unit as the length to snap to. The original mod overrides a method in the core, and only allowed this snapping for zoneable networks. I'd say this should now be working for any network you're building. But, huge disclaimer here, I'm not familiar with C# at all, nor the code of the game or anything. I was just bothered with this bug and the author of the mod abandoning it, so I tried to fix it myself.

Source is available at https://github.com/tunaflish/PrecisionEngineering . Also, since this was the test workshopitem cloned directly from the original mod, I'm gonna have to remove it. I've uploaded a new version of the fix at https://sp.zhabite.com/sharedfiles/filedetails/?id=2083188521 .

Interesting and useful - GitHub? Would be good to see the source to see what you've changed (and help with identifying any issues).