I've released a plugin to view models and animations from MGS4. This will allow you to view textured models without having to extract textures from their cache files, you can also view animations. To view animations you have to select 'Prompt for Motion Archive' in the tool menu. You can grab it here. https://github.com/Jayveer/MGS-MDN-Noesis/releases
It is worth reading the usage to see the various options. In particular if things aren't looking right you can choose 'Skip Normal Maps' in the options as there are material flags I haven't researched yet. As stage and slot files are linked the stage related slot files may require the DLZ and TXN files from their related stage files to be placed in their directory. In order to make sure you have the files extracted properly it's best to use the MGS4 extraction tool I made here here. https://github.com/Jayveer/Solideye/releases
The rules have been updated, read them now: Rules!