Personally, I'd hold off on the fuel tank right now. One thing I've figured out from building kits is that you never know exactly what kind of space you'll have for sure (for a tank) until you get it finished. I'd get the thing built, and then get the larges tank that will physically fit in the alloted space. 8 oz might be the biggest, or you might be able to get a 10 in there, but it might have to be a different shape than the one you're buying. Make sense? Best to take the plane to the LHS (again, swallow pride) and fit some tanks in there after you're done, if you're not completely sure about what will or won't fit.