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By Golden Eagle .68 (pbn: -=TigerPB=-)
Not the greatest model, and I got the bit on the back wrong. Oh well.
Extract the file wherever you'd like. Rename it according to the following guide (for example, to replace the Angel, rename it v_angel)
Once you've renamed the file, browse to your DPB models directory.
Should be something like "C:/program files/steam/steamapps/your username/half-life/dpb/models"
Copy the file you renamed and paste it into the DPB models folder. It will ask if you want to overwrite the file. Click yes.
Open up the game and choose that marker to see the model in game. The marker displayed in the buy menu and visible in other players hands will not change however.