Made some progress today. This motor is way too big for this mount, I had to create some room for it to fit.
I was planning to have the mount screws to enter from the bottom, but the motor is so large the nuts don't fit :). This thing is going to be a monster...
So the nuts are hanging from the bottom, not very slick but it works.
Next I made a rear rest thing for the motor, it's from the DBX VE so I used it. It too had to be fitted for this large motor (+ room for a screw on the motor).
This is the result. I am still waiting for that HK ESC. This is going to be cool...