The port should be the airport

A Work Permit issued by the Ministry of Labor cost 3000 Baht. Most people go for the two year option costing 6000 Baht.

65K each month must be provable as Foreign Origin.

Because an O-A Visa is applied for in one's home country at a Thai Embassy / Consulate. The Financial Requirements are normally in home country currency equivalent to Baht amounts. The 800,000 Baht Equivalent must be in the bank 3 months prior to Visa application. Account is in the visa applicant's name only.

TR Visa - 60 days plus eligible for a 30 day Extension of Stay at Immigration for 1900 Baht

65K per month X 12 months history

In normal non Covid times - when the Thai Border and neighbor country borders are open - the Non Imm O-A Visa Multi-Entry has an unusual property... (again in normal times). At near the first year Expiry of the O-A Visa (a few days before expiry) One could just Exit -Thailand - Enter the Neighbor Country - then Turn Around Exit that country and next Reenter Thailand AND get a full 12 months / one year added. Thus the O-A Visa became a 2 year Visa without a formal Extension of Stay being processed.

I am absolutely certain this is true. However, the borders have to be open to allow a classic border run at near the Expiry of the Non Imm O-A Multi-Entry Visa. However in this type of O-A second year the rules operate more like an O Visa Extension of Stay where any exit of Thailand requires a Reentry Permit.

There is another way (in normal - non Covid times) to obtain an O Visa for Marriage 12 months Multi-Entry. That is when the Borders are open and one can visit the Thai Consulate in Savannakhet, Laos or in HCMC - Ho Chi Mihn City, Vietnam... Then pay 5000 Baht, present a letter from the wife verifying marriage, her ID Card, Thai Marriage License...No financial requirements. Under this Visa One has to Exit and Reenter Thailand at 90 day intervals.

The standard O Visa for marriage - then processed into a One Year Extension most certainly requires 400,000 Baht in a Thai Bank Account. Or - one can proved 40,000 Baht transfer deposit each month for the previous 12 months brought into Thailand from a foreign source. Or the 40,000 from a salary - money earned in Thailand when the O visa / Extension holder has acquired a Work Permit - which is allowed to be done under this O Visa / Extension category

Sigurd - you are Wrong