I should have done this before but I've just looked at the requirements for a Non-O on the Thai embassy in Laos and your situation is not covered from what I can see unless you are working or studying in Thailand?
I wouldn't even mention your husband on his application. He's your dependant, not your husbands. I assume the birth certificate was authenticated by the Thai Embassy in the country that issued it?
So did you actually show 500k baht or equivalent in a regular bank account? Did you have a letter from your company giving you permission to work remotely from Thailand?