RE: E motor dims
The E-flite Power 160 is 72mm from back of mount to the front of the hub and 9mm from front of hub to motor. This is when mounted at the rear with front prop hub per your drawing.
Per the spec:
Weight: 650g (23.0oz)
Overall Diameter: 63mm (2.50 in)
Shaft Diameter: 8mm (.30 in)
Overall Length: 64mm (2.50 in)