This is just my first try at this, it isn't perfect, you may have to widen the motor mount holes, sand some things..etc. So download if you want, but it isn't a final version.
I originally thought I'd put conards on it, thus the forward holes for a spar, but decided not to.
Also note, I accidentally made the distance from the motor mount to the end 200mm, leaving no shaft to stick out. So the whole pod file has the long tail, but the individual tail part is 15mm shorter.
Bearings used both for replacing motor bearings, and for supporting the shaft at the end of the pod: http://www.ebay.com/itm/251149974179?
200mm long 3mm shaft: http://www.ebay.com/itm/321896439905?
The pod's walls are made of two 1 layer thick walls separated by 3mm and 3% infill. Or you could just say 3mm thick hollow walls.