Looks like you got an OS version mount?

EZ Beat On 50 originally came for OS 32/52. Then, Ok model added mount for YS 53. It was sold as YS version in the state.
I have all Beat On series excep the 2x2 version.

Original design dates back to 1990. For a 20 years old design, it is more than capable as a beginner's pattern plane.
I am not sure about aileron reversal. 90 size Beat On doesn't have it.
What servos are you going to use?

Keep the weight down. For the first flight, make sure to use forward CG.