Aha, okay. Then I would send the 'coming in' flight and maybe upload a remark sheet for the return flight with 'want year extension' or so. Bit strange for me they ask also a return flight with a non imm. O.
If it's a one time thing I just would use the Bangkok bank app. Yes, maybe it cost a bit more, but otherwise you have to use an app like Deemoney or so (Registration, setup, etc. etc.)
Not sure for 30 day extension. Always did year extensions.
The picture of you is one side of the STM2 form.
Other side is Acknowledgement for permanent stay so think that's not needed for sure. For Korat we also have a deposition form which you also not need.
Think the TM7 both sides is okay and maybe the overstay part which you showed.