Noesis (3D model viewer and extractor) http://www.richwhitehouse.com/index.php?content=inc_projects.php&showproject=91 

Noesis Bayonetta (Plugin required to view MGRR models) https://github.com/Kerilk/noesis_bayonetta_pc#readme 

Texmod (I haven't been able to make this work but others have) https://gamebanana.com/tools/6973

MGRRTools https://www.nexusmods.com/metalgearrisingrevengeance/mods/313/

I'm posting this tutorials on my Youtube channel (@GamingWithPortals)

Seriously thanks to these invisionfree people (mostly UltimateXeallar) who went through the labor of doing most the lifiting for us. You can access the file names using the "File Names" tab on the header or, this link