I'd like to show the forum members the new 500X4 Carbon Quadrocopter.
It is 500mm motor centre-to-centre, weighs 330g,
and has a sliding-locking battery tray typically used with a 3S 2500 pack.
It's the same tray used on the larger multis that can accomodate 6S 5800's.
Can take 30mm motors.
There's no Assembly Guide at this present time sorry, but they are very easy to build and very similar to the larger X4650 and X4950 which does have an Assembly Guide.