How to select UAV frame?

I am considering building a smaller UAV with navio2, of which the size is less than 300mm. So could anyone tell me how to select the right components such as motors, propellers, etc. After my first look, I am pretty interested in this one:Radio Control Planes, Drones, Cars, FPV, Quadcopters and more - Hobbyking.

So could anyone tell me what I need to take into consideration when select both frames and accessories?

You can use small frame but mounting optional hardware will be inconvenient.
I advise you to use bigger frame.
You may read these recommendations.

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Thank you very much!