Am gonna have plenty of air going through- will have an air ram scoop in the hatch and air exit holes.
As far as maintainance goes and connecting wings e.t.c, its easy peasy, the pipe only needs two bolts to take off and then it just pulls out of the plane.
The hatch will come off straight away after the first flight to see how hot it gets in there. The main thing i'm worried about as malc says is exhaust gases getting inside the fuz.
fingers crossed!!