There are already a few Garret mods out there. There's the race mod, his armor set, and his sound set.

http://www.tesnexus.com/downloads/file.php?id=14260

http://www.tesnexus.com/downloads/file.php?id=27868

http://www.shsforums.net/index.php?app=downloads&module=display§ion=download&do=confirm_download&id=584

I was thinking how awesome it would be if someone perfected some of these mods or added more.The race mod looks just like Garrett, but it could use his scar, and maybe a few racial abilities that caters to stealth. And it can use more clothes that resembles the ones that he wears, like his sleeveless outfit. This would be like the most bad ass mod ever for thieves.

http://images.wikia.com/thief/images/7/7c/Garrett2.jpg