Castle stats?

I didn't realize there was a forum devoted to modding until now, hehe. I should hang out here more often. Anyway, I'm trying to find a way to edit the stats on castles. Specifically, I want to make the gatehouses act just like stone walls where enemy troops can't just hack away at it with their swords until it falls down. I'd rather make it necessary to use siege equipment to breach the castle walls. Is there a way I can do this? I've snooped around the MTW folder but so far haven't seen anything that looks relevant. Any help is greatly appreciated!

I don't think so, I think this is hard coded.

Actually, I ended up finding it in the most unlikely place: The 'models' folder. I thought this folder would just hold the 3D objects so I ignored it until now. But the file is called 'MODELDAMAGE.TXT' and all you have to do is go to the gatehouse and erase the line that says 'attackablewithhandweapons'. Now you can't conduct a siege on a stone castle without the proper equipment. ;)