Thanks metrompg. We have had a few nice days this year. Every other day it just wants to stay 30F all day and rain/snow/wind, but nicer weather has gotta show up sooner or later. I had to go downstate yesterday so I took off the bars after taking the pic. Gotta go back tomorrow, then I'll be home for almost 2 weeks again.
About the flow, azraelswrd was kind enough to do this for me back in the flow illustrator thread.
http://ecomodder.com/forum/44755-post49.html
Which makes me think that the flow over the trunk is really not that bad, and the most benefit would be a stub tail that starts at the end of the trunk, sorta like #2 in my original sketches. It certainly would be a lot easier to make.
But I'm not so sure about the accuracy of the flow illustrator, especially when everyone said that the angle from the top of the back window to the tip of the trunk looks too steep for attached flow. I would think the people here (who are going to have first hand experience) would give better advice.