Rig a plain vent for the smoke oil tank. Rig the smoke oil feed from the pickup, along the rear of the fuel tanks, and out the bottom aft of the drain and through the firewall.
Rig the plans fuel tank vents, with separate ones at the aft inboard corner. Wasn't game to just go direct across the tank from the corner, it just looks like it need more support, so run the plans vent under the fuselage flange until well forward of the strainer, (and the eventual capacitance gauges) and then across. I'll tape them later.