New HL2 mod

Im currently making new models with XSI for a mod im working on, but i want to know if those modifications are possible by coding or something.
1. Changing the crosshair cursor and the health appearance in HL2.
2. Changing the weapon switch mode appearance and its weapons.
3. " The player appearance by a custom model i've made.
4. " The player's available mouvements, Ex. "Sleep mode"
5. " Some actions Npc's could do, custom actions.
6. " Finally, i wanna know if you guys have a realistic fire model for a flamethrower.<
I want to know if those are possible and how i can make them.
TY

Ok, I don't know the Half-Life 2 structure aswell as I know the Half-Life 1 structure yet, so I'm going to kinda of make educated guesses based on the Half-Life 1 structure and what I know about the Half-Life 2 structure.

1) Possible, should be a tga or similar file somewhere, if not than you need to change it in the code.
2) Do you mean changing the weapon huh thing?. Possible, should be a tga or similar file somewhere, if not than you need to change it in the code.
3) Possible, just name it the same and place it in the same directory as it is in the Half-Life 2 directory but put it in your mod.
4) Possible, you need to do this in the code.
5) Possible. If you want these actions to be part of the AI, than you need to change the code, if you just want to script these actions, no programming required.
6) Fire model? You should use a sprite or the Half-Life 2 particle system, I'm pretty sure Half-Life 2 has a particle system.

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Aaron's Stuff

Yeah, well do you know how i could open and change the tga files, or the codes without using GFC scape.

Without Gcf Scape?, you need some sort of program to open the gcf files. All the tga files are embedded inside the gcf files. What you have to do is save the edited gcf files inside the corresponding directory whether it be in the Half-life 2 folder or your mod folder.

As for the code, just setting yourself up to edit the source code is hard enough, but than you need c++ knowledge and knowledge if the source code structure for Half-Life 2!

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Aaron's Stuff

GCFScape extracts GCF files, and there is a nice plug-in for Paint .NET which allows easy manipulation of .vtf(s) here.