I would be grateful if those experienced with unpacking textures and making texture modifications for the PSP games could assist me in how to approach this further.
I have unpacked the Wii rom for MHG with Dolphin and then by using GNTool, the resulting .fpk container under the fpack directory which appears to be where the game assets (other than sound and videos) are stored. I get the following file structure:

If we open one of the folders here such as 'npc', you will notice that files are paired with an amh and a tex variant, both being bin containers. I would take a guess and say that the 'tex' files are textures. This is the case for many of these directories where it seems data is stored in model/texture pairs of files.

Now my question is, how do I extract these textures into image formats such as PNG so I can get started on the process of attempting to port these to MHF1, or is my approach completely incorrect and you're meant to use Dolphin's texture dumping tools?