@Michael ********
, you do not need to show proof of funds when applying for a 90 day Non-Immigrant Type O visa based on marriage to a thai at the thai consulate in Vientiane, BUT you do need to make an appointment using the online booking system.
IF you want to get a year-long, multi-entry Non-O visa based on marriage without needing to show proof of funds you have to go to Savannakhet Lao OR Ho Chi Minh City Vietnam. Those are the only two consulates around that sell the year/multi Non-O based on marriage with no proof of funds.