Random models and textures aren't loading for me. I don't know the whole list of what the problem texture are, but I know that supermutants have transformed into floating guns, and bloatflies switch between certain nondescript textures.

So I'm looking for a mod which changes the model/texture of every single NPC. It's a big ask, but I bet someone has done something along those lines.

Load order coming up:
Fallout3.esm
Anchorage.esm
ThePitt.esm
BrokenSteel.esm
PointLookout.esm
Zeta.esm
CALIBR.esm
CRAFT.esm
FO3 Wanderers Edition - Main File.esm
Stealth Kills Enabled - Pitt Compatibility.esp
RobCo Certified.esp
Wasteland Whisperer.esp
Portable Tent.esp
PreWar Book Titles and Perks.esp
CASM.esp
Stealth Kills Enabled.esp
Rude Awakening.esp
Gifts4Kids.esp
WeaponModKits.esp
WeaponModKits - FWE Master Release.esp
WeaponModKits - OperationAnchorage.esp
WeaponModKits - ThePitt.esp
WeaponModKits - BrokenSteel.esp
WeaponModKits - PointLookout.esp
WeaponModKits - Zeta.esp
FO3 Wanderers Edition - Main File.esp
FO3 Wanderers Edition - Followers Enhanced.esp
FO3 Wanderers Edition - Alternate Travel.esp
FO3 Wanderers Edition - Optional Worn Weapons.esp
FO3 Wanderers Edition - Optional Restore Tracers.esp
FO3 Wanderers Edition - Optional VATS Realtime.esp
FO3 Wanderers Edition - Optional Free Play After MQ.esp
WeaponModKits - FWE Optional Worn Weapons.esp
DarNifiedUIF3.esp
sunglassescollection.esp
Mart's Mutant Mod - Hunting & Looting.esp
Mart's Mutant Mod - Tougher Traders.esp
Mart's Mutant Mod - Natural Selection.esp
Mart's Mutant Mod - Zones Respawn.esp
Mart's Mutant Mod - No DLC Increased Spawns.esp
Mart's Mutant Mod - No Floaters.esp
Mart's Mutant Mod - DLC Anchorage.esp
Mart's Mutant Mod - DLC The Pitt.esp
Mart's Mutant Mod - DLC Broken Steel.esp
Mart's Mutant Mod - DLC Point Lookout.esp
Mart's Mutant Mod - DLC Zeta.esp
NotSoFast.esp

Total active plugins: 47
Total plugins: 64

Sounds to me like you don't have archive invalidation activated or you are missing textures/meshes from MMM.

Also all the FO3 Wanderers Edition - files belong above the WeaponModKits - files, not below. And you are missing the FWE-MMM foip patch.