Did you convert the sounds to 48000Hz?
If not, download Audacity, drag and drop your audio, change Hz to 48000, File > Export Audio, "WAV (Microsoft) signed 16-bit PCM" and save

open your .map in notepad, and check if the line 1 have "iwmap 4" on in, if not, add it

Did you rename j_gun to tag_weapon in the anim xmodel?

There is any way to change the zombies models to a custom one?

Check your joints positions in maya, this happens to me when i let a joint in wrong position

Same problem here

You can add sound to DLC weapons by creating a sound alias with the notetrack name(i export a anim with Wraith, find the notetrack name, e.g. "fly_famas_mag_out", and it worked lol), just take a sound from other CoD and make as putting sound for ported weapons

it happened to me when I forgot to use the "renameRig.mel" script

For some reason, had a joint out of tag_weapon, delete it and works, TY

You need to modify 2 files in BO3 root folder\usermaps\(map name)\zone, you will see 2 png files, loadingimage.png and previewimage.png, just modify in a image editor 

When i add my viewmodel xmodel_bin file, APE insta crash with these errors appearing several times