Custom first person animations in Crysis

Mr. Brightside

Never made first person animations for Crysis before and I have a couple of questions for the pros here at polycount

1. When animating can I use link constraint with the magazine, triggers, bolts etc etc or do I have to use point helpers + physique modifiers like this wiki page suggests? http://wiki.crymod.com/index.php/Weapon_Exporting
2. When importing a custom weapon does it "replace" another weapon or can you make completely new weapons?
3. How many animations does Crysis use and what are they?
4. Do I need to create bones for the Muzzle flashes + shell ejections?
5. Do I have to have crysis in order to use the sdk (to test animations)?

Thanks in advance...