Bob I'd be tempted to use 3/16" brass tube for fuel lines in wing and neck it down where fuel lines connect and solder barbs on them, there would be less restriction in a larger fuel line making it easier on the engines pumps. You could also use the larger line stopper in the tank, you will need seperate fuel outlets, don't make the mistake of connecting them to a Y, sounds like you need a 4 hole stopper to make it all work right. Just my thoughts.
Arn't the nacelles large enough for a 14 oz. tanks, I use one on my DLE35cc and it runs for a bit over 20 min. with plenty of gas left , can't emagine yours using much more.
Your doing good, it's coming along nicely.
Leroy