Canvas is a beast

I’m having a tough time with Wootheme’s Canvas and child themes. For one, I’m having trouble with adapting it to Buddypress and multisite. Where before I was strictly Freshnews and plussing out the custom.css and sharing headers out to other themes for sites on the network, and I was loving that.

Now. Child themes have me going in circles. Some of my old bad habits still work but some willy nilly-ness is going on with a couple of functions and I miss my old custom.css. Any one know how to get a custom.css to work.