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Advanced Warning: You NEED CFW for this part to work
Requirements

Memory stick (FAT32 Formatted)
EU or US SKYRIM.INI template


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Procedure:

Download the SKYRIM.INI template for the region you desire
Download the PC Mods that you want to port to PS3
Extract the Files from the zip file (if needed)
Rename all the Files using Capital letters. Eg “ragonBoneWeaponsComplete.esp” to “RAGONBONEWEAPONSCOMPLETE.ESP”
Open the SKYRIM.ini template in a text editor.
starting from “sTestFile2=” insert the name of the .ESP file (all in capitals) eg “RAGONBONEWEAPONSCOMPLETE.ESP”
if you have a second mod, insert it at “sTestFile3=”
DO NOT insert anything at “sTestFile1=” as this is reserved for the “SKYRIM.ESM”. in other words the SKYRIM game itself 
If you have any .BSA files as one of your mod files, insert it at the end of : “sResourceArchiveList=” with a !!!comma then a space!!!
eg. sResourceArchiveList=SKYRIM - MISC.BSA, SKYRIM - SHADERS.BSA, SKYRIM - TEXTURES.BSA, SKYRIM - INTERFACE.BSA, SKYRIM - ANIMATIONS.BSA, SKYRIM - MESHES.BSA, SKYRIM - SOUNDS.BSA, DRAGONBONEWEAPONSCOMPLETE.BSA
Save the file and Exit.
Copy the SKYRIM.INI file and your PC mods to the Memory stick
Load up your PS3 and enter your File manager
Navigate to SKYRIM installed on the PS3 HDD eg “dev_hdd0/GAMES/BLUS30778 - [SKYRIM US]/PS3_GAME/USRDIR/DATA” or “dev_hdd0/GAMES/BLES01329- [SKYRIM US]/PS3_GAME/USRDIR/DATA”
Copy all the PC mods here
Now up one directory to the USRDIR folder and overwrite the SKYRIM.INI file
Exit the File manager and go play some SKYRIM. That’s it…..that simple

Where do I get the Skyrim.INI template?

Also your test files will be as many DLCs you have installed too (dragonborn/that vampire one)
I know you can't replace mesh files on new vegas and they are still using the same file systems and engine guts so... good luck I suppose.
I was always able to install a mod that was solely a .ESP file though... It's odd there's even that much of a problem.
PC has a mod called archive invalid invalidated and I think that is your problem here as well, try copying what it does maybe? Honestly this last line was just guessing, good luck.