From what i understand this ai tornament will involve changing the .ai file values, if you have tak switcher installed go to cavedog>Kingdoms>ais and open one of the customs ai files there with notepad.
You can then change the weight - the chance that the computer will build this unit, and the limit - the maximum number the computer will build of that unit.
That is all, there is no way (that i know) you can change the attributes of the units so this AI editing will merely involve editing what the computer will build, so effectively you could set an ai so it only makes a barraks, then just builds swordsmen by setting the barraks weight to something like 5 with a limit of 2, and swordsmen weight to 5 with a limit of 200, all other units will have weights of 0 so it won't build them.
The ais will then play against each other and we will see who wins, i'm unsure whether this will work well cos ai's seem to play quite defensively most of the time, wqa have you tried playing 2 ais against eachother without you having any units to see if they attack, otherwise it will take all night!
i hope this solves the confusion