Best to get onto the other forum as there is a lot more info on the HET models and a lot of build threads. Hook usuallyis a few inches in front of CG but again, the build threads will be more helpful than any manual!
The 2W18 pulls around 55-58 amps so you will be ok if you get the ESC's into the duct for cooling, really any esc you use will need airflow regardless its size.