I guess I'll just leave an inch or two above the baffles for some return in case of a power outage.

Are there any 'rules of sump building' that I should know about? I would hate to get this thing built only to find out that it would be much better if I just did one small thing differently. I am going to add a crash area for my overflow, like your nano. I was already thinking about it, but your posts convinced me that it would be very useful. I don't need my skimmer sucking up a bunch of bubbles.

I updated the diagrams in the first post.