SF42 and SAbows stuff are totally different however. WIth sabow/gtos you can not edit pre existing campaigns. Although you can remake them more or less the same. But it takes some config work and using the included tools. Vary VARY few people have actually done anything.
Steel Armor: Blaze O War (SABOW)---
ISABOW mod. Check Graviteam forum. New AI vehicle M113a1 with recoiless and M106a1 self propelled mortar carrier. Much of other little stuff too.
Requires AUG SABOW patch from Graviteam. Enjoy