oh yeah sorry. thank you i will try this out. and yes i do have some gimp experience 
EDIT: i am having trouble with putting my sniper cross hairs into the common.lvl. i did this part i think: get original tga/msh/odf/fx in folder "Data\Common\", edit and save in "Custom\Common\" but i don't understand this part: launch common.bat for build common.lvl in folder "_LVL_PC\Common\ENG\"
any help would be great

EDIT: i am having trouble with putting my sniper cross hairs into the common.lvl. i did this part i think: get original tga/msh/odf/fx in folder "Data\Common\", edit and save in "Custom\Common\" but i don't understand this part: launch common.bat for build common.lvl in folder "_LVL_PC\Common\ENG\"
any help would be great