The Sandcrawler Mod Version 1 is good to go and can be downloaded from here.
http://files.filefront.com/Sandcrawler_Mod_Version_1/;7483634;/fileinfo.html)

The features of this mod include:

57 Custom MP Map Files
Custom Character Models/Textures
Weapon Tweaks
SP Map and AI Accuracy Tweaks

This mod runs changed stock files from a unique folder and will not clash with retail files. As such, you will have a Mod Desktop Shortcut to enable quick loading of Sandcrawler Mod Version 1.

New Model displaying change of projectile.
http://static.filefront.com/images/personal/a/arramus/49990/upqbrfqxtj.jpg)

Halo conversion of Wizard and Timberland.
http://static.filefront.com/images/personal/a/arramus/49990/fhmzlfmogq.jpg)

http://static.filefront.com/images/personal/a/arramus/49990/hosaodcjsd.jpg)

Videos of modding in progress.
AI Accuracy Test - http://www.youtube.com/watch?v=pOjxxC6AP_E)
Weapons Mods - http://www.youtube.com/watch?v=0f11pFe2RUs)
Player Test - http://www.youtube.com/watch?v=Qz1TfG6efV4)
New AA Test - http://www.youtube.com/watch?v=QlHfk9rwhAE)

Messing about on the river.

http://static.filefront.com/images/personal/a/arramus/49990/dvfzhacwst.jpg)

http://static.filefront.com/images/personal/a/arramus/49990/czpyzhpjtm.jpg)

http://static.filefront.com/images/personal/a/arramus/49990/rdinkxutsj.jpg)

the link's broken :( is there another one?

I found a link to a modding site, give me a sec to post the link ;)

http://www.republiccommando.net/)

check it out, it links to several sites ;)