Slow down, you are doing too much at once.
I’m not rendering legal advice, but sharing what I know.
1st - I assume you bought the land for her. (You own nothing and will be happy - maybe happy)
2nd - Prepare a 30 year lease with a Superfices agreement immediately. Include a receipt noting the lease has been paid in full for the amount you gave her to purchase the property.
I’m not married so it’s Lease and Superfices. You usufruct. What ever you signed at the Land Office negated all your rights. If you get divorced it’s hers.
You will then have a lease and rights to build a house.
I got great advice before moving Thailand. Someone told me to just figure what ever you buy and build be willing to and can afford to walk away from at the end.
Right now you have only made a contribution.
One company.
Study up:
*****************************************************
Study up, do your homework. Get to the legal website and read the contracts. Some of the websites let you read the entire document but you just can download a usable copy.
Really know something - I’m not cynical but I don’t trust Attorneys my own country why would you just trust Attorneys in a foreign country. I want to know and understand what they’re doing and why.
Moving to and living in Thailand is an on going process not an event with closure.
My 2 cents.
Secure your position now then work on the next thing.
Remember if someone says don’t worry about, worry about it.
Keep us posted.