I want to get started on my first multiwii project. Since I'm new to Quadcopters, I was thinking of trying to buy the hardware as much ready to fly as possible. I would like to concentrate on the software anyway.
Ideally I would like to start out with something like the V929 beetle quadcopter:
http://www.banggood.com/Wholesale-Wltoys-Ladybird-4-axis-Dexterous-Mini-Ufo-Rtf-p-46172.html
It is simple and light and reviews are very good. It has a small receiver/flight controller board which directly drives the brushed motors.

Furthermore I'm thinking about buying a sparkfun pro micro arduino board, because it is light and has an integrated USB connector.
I searched on the forums a lot about using brushed motors and a pro micro board with Multiwii and both seem to be possible. However I still have a few questions about connecting everything together.
The v929 receiver has to be connected to the arduino board. If I understand correctly, it outputs a PWM signal that drives the motors. Can this signal be used as an input for the arduino board with Multiwii?
Then the arduino board has to output a signal to the brushed motors. I understand that in the multiwii software it is possible to enable PWM output for brushed motors, however to operate properly, mosfets has to be used in between.
Is this correct?
Another way to approach this is to loose the receiver board altogether and replace it with the arduino board with a separate receiver. Will this be a better idea?