Perhaps a mod with an invisible head?
If that's what he means, which is like what you used to be able to do with skin changer (invisible skin), you can always do this:
1. Go to your gostek folder.
2. Look for all files with "morda" and "dlon".
3. Colour all of them bright green (the bright green colour that surrounds the picture of the head and hands)
There. If you have done it properly, you'd see that you have no head and no hands, just like the invisible skin mod that older Soldat versions could have. You can see hair and hats just as before.
Though there's one thing you may not like: You see EVERYONE else also having that same "invisible skin" when you play, whether offline with bots or online. If you've modified the "Team2" folder's morda and dlon as well, then you'd also realize that those in Blue team also share that same appearance.
EDIT:Careful about those files in "ranny". If you do the same to those files, you'd realize that you CANNOT see your head bleed. Which can also be a problem when you're fighting against people with predator mode because you can't see their heads as well.