14 vs 7 textures - well AFAIK M&B isn't using a different texture for every terrain type. The "forest" terrains seem to just be regular terrains with the game adding in some 3d trees, "deep ocean" seems to be just the regular ocean texture and I guess the game is doing something texture or shading wise in real time. I haven't focused too much yet on getting an accurate (other than being able to distinguish different terrains) representation of the game's texture, because the prospect of getting it just right seems like it could be difficult. (You might have better luck than me on this front. Especially if the engine you're using is the exact same M&B uses - no idea if that's public knowledge or not.) I know there's a few things the game seems to do that isn't simple texture mapping, like the snow on mountains and the animated river textures. I still have some work to do to better understand what the game is doing to render that map.
Also, I could only find the 7 textures in M&B's resource files (the actual ones the game has are much larger, and are BMP format), and I wanted to focus on actually getting something 'working', so that's what I stuck with for now.