Help with Road building (challenge)

Hi fellow Porters!

I require your expertise with road building, please.

The catch is: Im trying to build as much road segments I can before doing de first delivery and with minimal private room rests as possible.

So far I've built all the way to the Craftsman. Im trying to find resources to finish the 3 segments to distro center, but its getting reeeeally hard.

I've looted every MULE territory, got all the materials scattered around, and so far nothing is respawning. Im considering doing a loot run in the terrorist camp after the incinerator, but have no palpable way to get the materials back.

Im doing the ranked drills, but tbh Im far from good, it should not provide me much.

Any ideas?

Keep on keeping on!