I don't know what to do with the altars, but teleportation will probably happen without being tied to specific place. This is so it would be feasible to set up a base somewhere remotely later on, and not having to rely on predefined waypoints.
But it might be fun to add some additional interactions to altars, maybe something hidden to figure out.
Yeah this is many many months down the line towards 0.5 that I'm thinking of but here's a general outline for base building I'm arriving at:
1) craft portable altar or something that when used in any chosen location creates the origin point for your base and the first node in waypoint network
2) Go out and clear existing altars of hostiles to claim them and add to waypoint network. "Forward Base" extensions to network should also be readily available/relatively cheap for expeditions further.
3)Feed Crafting materials or some resource to connected network. When requirements are met, select and place building parts/modules which teleport or fall out of the sky into chosen location
I'm not attached to any of this btw and teleporting whenever wherever as long as I'm not fatigued is cool by me too :P
Kinda feel like outline I've got here is maybe leaning too heavily on a Diablo 2/3 vibe (can that be a bad thing?), or something else is off with it, not sure.
