You are right that the GP kits are good quality. 

I have finish the turtle deck and am now starting to fit the engine, which leads to a question.  How do you set up your fueling line?  This is only my third gas plane.   On the first I could get to the fuel line between the carb and tank so I would just pull that off.  On my ME109 I have a third line into the tank;  what I don't like about this is fuel comes out from the carb when I fuel and I have to hold the plane nose down to suck fuel out.  Looking for advice.  I have OS 46AX and a Great Planes tank