Thanks for the feedback!
I'm not sure if it fits this mod, but what about setting rally points for spiders to follow along? That would allow you to have spider guards that go around your base, and maybe stop at the rally points for repairs. Let me know if you guys are interested in something like that.
I like the idea of rally points.
I'm imagining a scenario where the Elders left the Sentinals running the route and the player needs to keep filling sacrifice chests (and marking them for destruction) at an alter to keep the Sentinals supplied.