This is cool!
Actually in the process of doing something similar myself. (looking at e0designs.com as a reference)
Just a little note - from what I understood you would want to be able to play with the position of the sensors a little bit - I purpose that you should increase the size of the wire hole to accommodate for that.
Looking forward to more pictures and info.
This is my initial design (have a new one but not on my phone)
i am using honeywell SS411A hall effect sensors. i will try and get them hooked up to the scope tonight. maybe shoot a video of it? ill also post he stl files. i used SketchUp to "make the bracket" ill post the skp files as well.
Most of the escs sold by Alien are made by FlierESC. Flier has garbage quality control and high failure rate with pretty much everything they make. I'd recommend a different esc. FVT (Favourite) makes solid escs for e-boards and multirotors in my experience, so I usually use their products (or the VESC). Best of luck.