Hey I really want to create a two handed version of "Blades Sword", but how should I proceed? I've tried alittle myself... but the sword is invisible. I kinda expected that. Thats why I ask for help now...
You need to change a few things: the EquipType and AnimType in the weapon form (AnimType is under Art and Sound).
Also, if you look at the model file in NifSkope, you'll see that all the 1st person weapon models have a node stating the weapon type. You may need to make a copy of the .nif file and change that value from WeaponSword to WeaponBack, so it knows where to bind to the character model.