I used the money in the bank method. I made a withdrawal from my account and then got a bank account letter earlier in the day and made copies of each page in my bank book (3 pages).
In addition to the form/photograph; passport and bankbook, I provided photocopies of:
From my passport: main page; Visa; last extension; last entry into Thailand
All the bank details above
90 day report receipt
Hand drawn map of the location of my apartment
At the "Document Check" desk (L27) they gave me 3 more forms to complete - but basically just sign
At the "Online Appointment" desk (L32) I presented all of the above.
Nothing else was presented or required by the officer, who checked everything again, made some notes and referred me to another, more senior officer, in the next cubicle. She was busy at the time and asked me to wait outside. 5 minutes later my passport and bank book were returned all stamped up.