entered and exited Cambodia today by land at Chong Sa Ngam, cambodian official sat on Thai side before immigration. Looked at our passports, CDN and Belgian, asked where we had traveled in the last 3 months and said we would have no problem. Before Cambodian immigration there were 2 health officers, took our temperature and asked about where we had been for the last 3 months, gave us a yellow slip. Cambodian immigration attached yellow slip to visa application.
I think it is 100 or 150 baht and Tony puts your application in order and let's you know of any errors. Money well spent. Located across the street from the consulate.
Your permission to marry from the US embassy will need to be translated and taken to the Thai foreign ministry. If that is what your appointment on the 25th is for, you have no chance of marrying on the 26th if it is a legal marriage, not a village marriage. A village marriage will not get you a visa and is not binding, it is really just a good party.