You're going to want alpha in the textures, at least allowing 0% and 100% transparency so you can texture things like leaves on trees that have gaps between them.
Using values inbetween is of course harder as it required you to depth sort the polygons before drawing them to work right.
On the Vertex format - you might want to have location, normal, texture coordinates in that order rather that the one you have now. I know you're using opengl but if it doesn't matter for opengl then you might as well well make it as easy to use for all possible platforms.
As for the main file format, it would seem easier to me to load an index to all the file fragments rather than have to skip through the file looking for what you wanted. That's really what I mentioned zip for, was the index at the end of the file
EDIT: I meant to say the DirectX is slightly easier if the vertex compoents are in that order so why make it harder if it doesn't matter to opengl
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