I think the gaps are caused by the edges being not folded on a rigid square line, also, it is only necessary to fold the bend for the amount needed. If you need a 90 degree angle, don't fold it all the way over. If a bend isn't straight, you will get a error that just increases the problems along the way. Sometimes, in certain models, like the Rodger Young, they can be disastrous. Looking at the picture, and seeing how the gap forms, it seems that it was not folded properly,
One solution could be to make the nose section one piece, in Photoshop, then there are no open seams and that would shift the assembly to a perpendicular line connecting the nose to the rest of the craft. This may entail cutting out other parts. If you are real careful, you could run a seam that actually runs along panel lines and by it's nature hides itself.