I just came back from submitting my new retirement extension application. All things considered, it went pretty well.
Stopped off at one of the shops on Soi 5, got my photos, copies and the application completed for 150 baht.
At immigration, the young woman at the front counter, in school uniform, checked my forms and gave me my number. There were only three people ahead of me for retirement extensions.
At the retirement desk, the woman checked the package determined one more page of the passport needed to be copied and did it right there. She had me sign two copies of the form