What is the process for registering a custom-built trike in Thailand?

The post discusses the possibility of registering a custom-built trike in Thailand, interested by an expat contemplating retirement there. Several comments suggest that importing vehicles has become increasingly difficult or illegal due to stringent regulations, with hints that bringing in a vehicle in parts may be a workaround. However, there are risks associated with this method, including potential confiscation and legal implications. Many advise checking with legal experts or shipping agents before proceeding. The discussion touches on the complexities of Thai vehicle laws, especially for modified or custom vehicles, and suggests that purchasing or building a vehicle locally might be a more viable option.