For inspiration let me share that outrunner design. You might have seen some of that in a video before. I tested it last September with a PLA case as mentioned above and it burned down the SK3 motor immediately. Like you suggest @PowerGlider, I have the outrunner mounting plate towards the back. Cable routing challenges lead me to this fuselage-attached design instead of the previous mast-mounted ones. It was very solid. For the test I just taped the cables to the fuselage and fed them through the existing hole in my mast. I still like the simplicity of this design, it’s only 2 printed parts (shell and threaded lid) plus the prop. It was watertight during my short test. Problem was the cooling, so it will need a re-design with parts that can be made in aluminum. Tempted to pick this up again some time… right now I am working on a belt drive though, need to stay focused 
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