Thanks Ned. Real kind of you to do such quick feedback. The waypoints will need lots of minor tweaking no doubt. The biggest issue I expect will be routing the bots away from the ladder to the roof. This may or may not work since if they fight they no longer follow a route but switch to the shortest path. And stairs will calculate as longer than a ladder.
With so many flags to chose from I don't know how the bots prioritize, but the third floor flag seems to be top priority. I suppose I could route the allies from the roof such that say 1 in 6 (or less) pass through the gazebo flag thingy on the 4th floor.
Your screenshot is interesting. It looks like the bot kneeling is chatting which might suggest it is either stuck on a clip edge (I'll decrease node 213's radius JIC) or does not know how to navigate to its selected goal (zombie). I know the side pillars can be clip problems so if the one connection by the right pillar proves a significant trap I'll reposition the nodes to go directly at the door rather than from the side.
I take it the satchel-able door is the "stairs wall" Ill keep my eyes open for stickies there.
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Took a look at raw_castle. Honestly it gave my eyes a headache. I would not have thought it by the same mapper. Proportion and realism is what makes the best ET maps IMO. And here the mapper has merged in a few surreal elements (fallen leaves bigger than med packs!, mushrooms the size of dinner plates, and the axis castle was designed by committee). Its too bad because there is lots of very good work too here (the other castle is good). And as for storyline, Axis owning a castle in East Anglia! One thing is for sure it does not look the least bit like Norwich Castle or anything I saw of East Anglia.
Well Not having played it with humans, I just don't see the game flow right now, so I think somebody else should do its waypoints. Sorry. And I am debating whether I should do any new waypoints. 
My website hits are decreasing, the forums are slipping and ET:QW is only weeks away!