wow that plane is heavy compared to the pitts special,the pitts weights around 16 and a half pounds to 17 pounds,heres the pictures for you,the ones where the plane is all put together shows the fuel lines inside the cowl,i hadn't cleaned it up yet but it actually came out pretty good after the plumbing was cut to size and straped away,you know what i totaly forgot that yours has the wrap around muffler so im not sure this would work for you but well only trying to help,perhaps you can still get some idea from this set up