Organization is key. Have folders for: the model you want to graft onto the MP Character, the MP Character's model you want to use as a reference + the "model name FULL.skel", and a folder for your final product

Again, in your MP Model folder, have the xxx FULL.skel file alongside the model you wish to use as reference in there (and a .otd file for textures to show up in 3ds Max. Completely optional)

In the folder for the model you're importing, all you really need is the .odd file + its accompanying file folder from the OpenIV export

When in 3ds, import the new model first so you can have it ready for attachment/editing. Of course the order don't really matter, just my process.

Go ahead and delete ALL bones/nodes other than the "_high" model as such

Once that's done, go ahead and import the MP Model and select that model's "_high model"

Afterwards, go into the "Modify" tab on the right-most window, and go into the editable mesh. Use any of the 5 selection modes (vertex, edge, element, etc) and select the entire "_high" model using either ctrl-a or dragging the mouse. Then attach the selection to the importing model and hit delete.

Export that into your Final Product folder, and that's it. Keep in mind for this example, feet_010 was my MP Model and feet_000 was the model I'm importing

@Polimante You don't need to replace the original .odd file. I have a specific folder where I export the completely edited .odr file. When exporting, it should take the name of the original .odd you took from the MP character.

What I'll do is just lay out my process and hope yall can base what you're doin off of that

@Macgomes Change out the weapon clip set lines in the weaponanimations.meta for the Gusenburg. Also changing the wheel slot likely doesn't do anything. If anything it erases the icon from the wheel

@marck97 So to paraphrase, popgroups.ymt and/or vehiclemodelsets/meta.

@flying_bulletzzz Ok tell you what. I'm gonna go ahead and do the conversion myself. I honestly dunno what's going on, because the way I do, probably ain't the right way either. I don't think 3ds is built primarily for character editing, and I know for sho it aint meant for weapon modeling. So I'll see what's up

@flying_bulletzzz And are you naming the .skel model "berd_001 FULL"?

@flying_bulletzzz Lemme ask this, what is the name of the rebreather model? It should be "berd_xxx" or something like that

Also, I've been having trouble porting feet properly, so that could be it too, seeing as it's rigging as a feet model. So I would use https://www.gta5-mods.com/player/old-bugstars-outfit-for-michael#comments_tab for porting it to MP. But always remember, unless it's a R* made model, to always give credit to whoever made the model. In this case, Slick didn't make the model