> You search for the nearest storage building which provides the needed material

How would the lorry know that it can reach it?

> With the 'might need' approach you still could end up with your material at the wrong place.

Elaborate. I think it wouldn't be a bad idea to make the player organize so that lorries come to buildings in priority order.

Alternatively, we could have the lorry carry out the "find" actions itself: Just make it log whatever it passes by. As it will have to pass most things two times on a given run, this should be enough to make informed decision without any pathfinding or speculation.

> You don't have to look after every hole you dig, not every meteorite destroys your whole infrastructure and it's not that easy for an enemy clonk with a shovel to cut your whole supplies.

Assuming, of course, that rails are stable enough to survive meteors or equipped Clonks. Does that mean you plan rails to be invulnerable and permanent? If not, how do you decide who's able to deconstruct them?

> As well, your lorry becomes a transportation system to overcome obstacles like lava lakes or just an abyss.

We have that already, bridges. With the great side effect that it also allows your Clonks to alternatively just walk...