I've been down this road and it's very hard. As for sure you can not bye the land no matter what people say. Most only pass on info they heard . 1 on the day you buy land in a company you can not be part of the company .after the company bought the land then you can own 49 percent of that company. On the day you also wish to sell the land .Then you can not be part of the company. When I sold my house myself I payed normal tax in the morning after lunch they said as the land had a house on it there was 3./. Company tax. I flew a lawyer up from pattaya to deal with it so it was pay pay pay before and afterwards
i have a friend that that did not happen to. He was never banned by thais but was jailed be them at the request of uk government. After he was sent back to uk did time in uk jail. When he got out applyied for a visa to thailand
Was told he was banned for 5years and 5years as long passed every time he applies rejected now he and is thai wife to this day live in cambodia as he cant get a visa to thailand