The outline is expanding scene by scene (jotted down 17 yesterday - didn't write them, just noted what they would be) and last night (just before bed which is always the way) I finally figured out why Niall would have been sent on such a detail on his own - it's a punishment for not playing well with others. So I can incorporate that into the scene list/ layout.
My outline this time has a mongrel pedigree - I've read bits from Alexandra Sokoloff's blog on the three act structure; Lynn Viehl's (Paperback Writer) blog posts on Quantum Writing (1 and 2) as well as other bits and pieces filtered from the intarweebs and am using those pointers to help build the skeleton. We shall see!