I understand that 3.1 crosshairs cannot be used in 1.0.

But what about my 3rd ID allied skins.

And my custom sounds?

And my sniper scope

And my weapon models?

Can these be moved over?

1. But what about my 3rd ID allied skins.

2. And my custom sounds?

3. And my sniper scope

4. And my weapon models?

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1. No, they will have to be converted (and its quite difficult).
2. You could, but you should convert them to 16-bit sound with Cool Edit or Goldwave. Be advised that the weapon sounds should have the Shell-Tinkling sounds at the end, since, for some weird reason, DoD no longer utilities the /Player/pl_shell sounds.
You will have to append them.
3. Yes.
4. No, there are new anims and new sleeves. They must be converted.

I just copied and pasted my old thompson model and it works fine.