sburdic

There are probably other ways to go about it, but this is how I finally received my Thai ID:

Documents I had prepared prior to arriving in Thailand:

FS-240 - DoS certified, translated, legalized by the Royal Thai Consulate
DS-1350 - DoS certified, translated, legalized by the Royal Thai Consulate
Parents Divorce certifcate - DoS certified, translated, legalized by the Royal Thai Consulate
Father's Death certificate - DoS certified, translated, legalized by the Royal Thai Consulate
High School Transcripts - DoS certified, translated, legalized by the Royal Thai Consulate

2011-10-19 Arrived in Thailand
2011-10-20 Submitted translated & consulate certified FS-240 & DS-1350 to MFA in Lak Si for legalization 1600 Baht
2011-11-01 Met with Immigration "Pii Suut Sun Chadt" at Suan Plu 800 Baht
2011-11-01 Cotton swab DNA samples taken at Royal Thai police hospital 18,700 Baht
2011-11-04 Submitted translated & consulate certified Divorce, Death, and Transcripts to Lak Si for legalization 1200 Baht
2011-11-05 Deposited 100 Baht into someone's bank account so that we could receive a copy of the DNA results
2011-11-08 Quick chat with Amphur Pantong about how to get ID card.  Outcome: wait for Immigration to process DNA test...
2011-11-09 Pick up documents from Minstry of Foreign Affairs at Si Ayuttaya Road
2011-11-09 Back to Immigration at Suan Pluu for interview, fingerprinting (200 Baht), and Naam Jai (2000 Baht) - no receipts!
2011-11-11 Back to Immigration at Suan Pluu for interview (mother) and have her sign documents (divorce, interview transcript)

Wait for DNA results - about 2 months

Once the DNA results are complete, Immigration Special Division will issue a statement verifying my Thai nationality status.  With this document the amphur has agreed to issue me an ID card and enter me into my mother's Tabien Baan.