PMFG STFU PISS OFF U N00B
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Kidding, kidding.
Anyway, I'm have no idea when it comes to editing Deus Ex. But I don't think there is any way for you to edit the DX original game to get the shiny TCP weapons in place of the normal ones (Sig in place of the 10mm/G36 in place of the 30.06 Sniper/ Franch-SPAS 12 in place of the Assault shotgun/ etc.) except to edit the working of the original levels. But even then, that would more likely that not cause problems...
I agree it would be neat though.
Sorry I could be much help, Clark.
Do not despair, though. It might still be possible.
Plus, there are still a good number of interesting mods for DX around the web.
For instance...
http://hejhujka.deusex-online.com/