I take no credit for making these files.
CREDITS:

http://gamebanana.com/portal/skins/96881 --Portalgun
Portal: Project Beta (for the crosshairs and scripts)

http://gamebanana.com/portal/skins/34365 --Portals

Place the models, materials, and scripts folders into:
C:\Program Files\Steam\Steamapps\<<USERNAME>>\Portal\Portal

File Name: Portal.zip
File Size: 13.23 MiB

Click here to download Better Portals, Portalgun, and Crosshair!