I'm putting together the QAV400 ARF kit, which you can purchase here:
This first video walks through the process of constructing the frame. It's pretty straightforward and the only thing that caught me off guard was soldering my motors directly to the ESCs. Not a big deal, but this was the first time I've done this. The reason you may want to consider this approach vs using bullet connectors is mentioned in the build manual:
"The best way to assemble the motor/esc is by soldering the motor cables directly onto the ESCs. This will save you a lot of build time if your motors and ESCs don't already come with bullet connectors. It also will remove one of the key failure points on any multi-rotor. Bullet connectors can loose connectivity mid flight or one of the many solder connections that bullet connectors introduce can get weak and fail."
The build manual can be found here:
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Now that the frame is built I'm going to start with the DJI NAZA flight controller and then test with APM 2.5 then MultiWii. I'm looking forward to seeing how these different FCs behave with the QAV400 frame.