Updating an esp to change a weapon's texture and mesh

[nkorea]

I have previously made a post regarding a specific gun mod (http://www.nexusmods...as/mods/49100/?), here is what it said:

 

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I have been having a problem where a particular weapon, Colonel Autumn's 10mm pistol (I have TTW by the way) is using the wrong mesh and texture. What do I mean by "wrong" mesh and texture?

Well, I am using two mods that both change the same thing, before you tell me to change my mod load order, the two mods are Millenia's Weapon retexture project and this one right here: http://www.nexusmods...as/mods/49100/?

To cut to the chase, that other mod includes an optional file that replaces Col. Autumn's 10mm pistol with that texture and mesh, yet Millenia's retexture mod also changes the 10mm pistol, which is the same thing (visually, because Fallout 3 unique weapons). Things get complicated because, I thought that changing load order would be the solution but it's actually not. Why is this the case? Because Millenia's mod doesn't use an ESP - changing load order isn't an option because it doesn't show up.

So, how would I make it so that the other mod uses its textures for Colonel Autumn's gun?

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I was told that it wouldn't work because the TTW plugin is out of date since the ID for Autumn's gun has probably changed in most recent editions. So to resolve this, I would have to open the .esp in GECK to edit it. That's where the problems came.

When I opened the .esp, nothing showed up in the object viewer. This made me unable to really edit anything. If that's not what I'm supposed to use to edit the plugin, then I don't know what.

IF I do find the specific thing I need to edit, how would I know what to put in so that it would change Autumn's gun's texture and mesh? Where do I get the ID?