Kit bonuses against certain enemy types.

Hello everyone. I'm using my non enhanced edition installs to play Big World and I'm interested in using the RTT kit Giant Slayer. One aspect of this kit is that it gives increasing thac0 bonuses against "giant" creatures, and I had a question or two about this.

First, are bonuses against specific enemy types like giants able to be implemented into kits? It may say it does this in the description but I'm worried that in-game the bonuses wont be there.

Second does anyone know what qualifies as a "giant", at least for the non-modded BG? Giants of course, what about ogres, trolls, etc?