Looking to convert an MBX5T

[Shimmy]

I do like the Hobbywing stuff, and might grab the 150a esc one day.
I am looking for a lower KV motor, about 1600kv at the most.

I am thinking also the motor mount for the Caster truggy, I assume they would fit but might be abit more limited on gearing and motor size.

Does the MBX6T battery tray fit on the MBX5T?
The main reason I was thinking of getting a different battery tray is to be cheaper.
I understand why these ones cost $35, but its not worth it to me.

I thought about just leaving it with motor brakes but the main reason I want mechanical ones is to be easier on the esc, I figure if I give it an easy life, it will have a long life, especially on 6s.

On another note, does anyone know if the 1717 castle/neu motor will fit or if these mugens can handle that kind of power?
The other one I am thinking of is the Leopard 4082 1250kv (not sure if this is a bit too low a kv though).