I routed as much smoke oil as possible with soft aluminum. Planning to modify the lines leading to my injectors with steel at next opportunity. Will have to figure out how to anchor to the engine then run flex to the rigid line on the firewall.
Another thing to consider at this point in a build is rigid oxygen lines. Not such a big deal for a side by side since you can place the bottle in the baggage. But having a tandem, I'd like to do a remote bottle in either the fwd or aft baggage one of these days. Rigid lines will be required.