Why try to convet all that to a belt tail and brushless, why not buy a Bare Bones Belt CP and add the brushless motor and move everything else over to the Belt?
The servos and TX/RX and new gyro will worl fine just need to add a larger battery and you are flying a larger more stable heli.
There is nothing wrong with teh Hone Bee CP just that bigger is better for flying in adverse conditione.
Here is a link to who I get all my stuff from and has a great deal on a Bare Bones Belt CPv1
Yellow https://www.ushobbysupply.com/produc...roducts_id=560
White https://www.ushobbysupply.com/produc...products_id=73
Just an idea
Ron