Yes the saddle..where the wing sit's on.

You might also want apply a thin coat of epoxy on the right hand side of the saddle (muffuler side) to prevent exhaust goo from
penitrating under the film. It gets really messy right there. The film started coming apart on mine after a while.

The switch wiring looks okay to me.

The side of the switch with only one cable. That cable gose to the reciever.

The side with 2 cables. The male is use for the charger, the female is use for battery.
it's amlost fool proof.

You might wanna wrap your RX and baterry a bit more. Makesure there's foam around all the coners.
Bascailly during a crash, sometimes your radio equipments get exjected at a great vilocity
Generally the coners likes to impac the earth first.