Chad, as to the fixing in simple terms its glued in using a polyurethane, the stuff they bond windshields in with. There is a little more to it than that.
The next time I do one I will take pic's as I go. A pic,, with the motor out shows little as its black to black to black.
What you see there is a composite cup, carbon kevlar glass carbon. 24g. There are 3 air exits the size of the one in view. Inside dia,, is 65mm , ie 3mm clearance all round.
It stops short of the nose ring by ~2mm. The space is then taken up by rubber and the Pu adhesive, giving a slight soft mount effect, with bonding all round the front of the cup.
The fan blade is from a PC power supply, ~1Watt. To fit it in the spinner we reduced the blades by ~40% and its housed in a space with everything spinning together so now
approx 0.5W. (lay-man science). The front is cut off the spinner ,(off left side of pic,,) leaving a 15mm hole for air to enter.
With ambient temp of 20 to 24 C the motor temp is 28 to 35 C. Also this allows us to dedicate the chin intake air to the esc, which I do with a moulded carbon shroud ~8g.
The esc at most is 2 to 3 C above ambient and on cool days no increase at all. Have not worked out the efficiency benefit, but know with electrics cool is cool, cool is good.

Regards

Brian