well there are a ton of models in hammer already (use a prop_static) or u could head over to the model section of the forum:http://forums.tf2maps.net/forumdisplay.php?f=17
or if u really wanna be adventurous (yes i cant spell ) theres a modeling program with the sdk (i think never actually used it) its callled XSI i think
It is linked through the SDK, though. XSI is nice because it has easy to use options for exporting SMD files, which are used by your studiomdl.exe (in your sourcesdk\bin\orangebox\bin)program to make a finished model.
Theres someone on this forum that keeps saying its a good idea to use model textures that are already in the game to reduce file size...I want to ask how thats done...but don't remember who it was <_<
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