Well, for KA the maps can vary from small to medium sized maps of any kind, depending the gameplay mode you want to use, you should adapt them, if you want to make DM map you have to make it with lots of weapons and ammo, also you could make some places to hide safe or something, heh!
If you want to make a CTF map, it could be medium sized and you can make the bases for both teams and their flags, you could put some traps also, a lot of ammo is a good thing too, depending the map size.
For Critter Hunt you could make it as a single player mode map, it will have a lot of monsters or points for the monsters to teleport.
For SE anything you can work a nice castle dungeon or something like that, also you could make an open area for the player to move around the places he will visit, I don't know exactly which maps are needed for it, maybe Ramborc can answer you this better than me.