Here are a couple of pics, sorry they are a bit blurry as I took them with my phone. My other cameras' batteries were dead. But like Mike said, there is nothing earthshattering about how this is done. The motor is mounted on standoffs like Mike recommends. I have done several models this way and it's simple and effective. You just need to make sure the firewall is absolutely stiff, so be careful how much you cut out of it for airflow. We did a bit too much and had to put a lattice type structure in to stiffen it back up.

The position of the battery in this pic is where I fly with it. What I need to do is pull out the tray that's in there and locate it more forward. Not a lot of work, but I am just not in the mood for it. It flies fine this way.

Tom