I just built an SE for a friend. Lipo on the front bottom on a Mr Carbon battery extending tray. Rx up on the top tray. ESC on top of the bottom tray located approximately between the landing gear legs and gyro on top of the frame in the usual location. Using 3s TP2100 Prolite Lipos. Many are using the Futaba 9650 but CSM likes and recommends the HDS877 Micro Digital Servo for their gyros. I have an HDS877 on my HDE. It holds just fine.
Some may ask why the Lipo in the lower location. I placed the Lipo low for a bit more pendulum stability as he is not used to micro Helis. After he is comfortable with flying the Lipo can be moved up to the top front tray to raise the center of gravity if desired.
The bird flys just fine and he was grinning from ear to ear