Since I asked a question in this topic, and for anyone that might find this information useful, here's my follow-up from Samut Prakan immigration:
For not loosing time in case my request was not approved I intended to do also a 60 days extension at the same time.
After getting my TM30 (online receipt) stamped (not sure what the reason was) the officer asked me to complete first my extension and then come back to the counter for the COR.
After my extension was processed I gave following documents for my COR :
Copy of passport data page
Copy of entry stamp page
Copy of extension stamp page
Copy of my Visa
Copy of the stamped tm30 receipt
There was no need for a tm47.
Didn't need more copies of my wife's bluebook and id (I guessed it was in the system due to the extension?)
Requested 3 certificates for : car licence , bike license and one for Bank just in case.
Only had to hand over one copy of the form and documents and 6 pictures (only had 4 on me, but was invited to bring the 2 missing one's in a week when documents will be ready).
No fees charged.
Everything was pretty quick and all employees were nice and great to deal with.