More great feedback, some really good points made. Thanks once again folks.

Less fin
It's possible I got a little fin-happy there. Here's a simplified fin setup that I think should offer plenty of yaw dampening, while minimizing interference drag...



Now you see it, now you don't
I've been pondering how to make the EDF go away when she's gliding. If this were a regular pusher-prop I could just use a folder to streamline the airflow. As far as I know, no one has invented a folding ducted-fan, so here's what I came up with instead...



A cylindrical sleeve covers the intake ducts until power is needed. That then slides back exposing the intake when it's go time...



I have a few ideas how to do this, will probably use a pull/return-spring system hooked up to a long throw servo. Slots in the fins & wing will act as guide rails.

So that takes care of the intake duct's drag. Now you're going to point out that I still have a blunt end where to duct exits. I'm okay with that I think. Especially as many cars are deliberately designed with blunt rear-ends supposedly to improve fuel economy somehow...



Yeah I'm not sure I'm buying that either but it is in keeping with the KF airfoil's tech... eddies creating aerodynamic shapes for the air to pass over. To be honest I'm not too worried about the exit duct, it is what it is. Anyway so that's the latest design...



Still looks cool & that's what's important right? *wink*