If someone setup their own business, gained the ever wonderful work permit, is that work permit tied to being director for mynewcompany, or can it be transferred/updated  so that you can work for any Thai company?

Thanks

No Dazdaz, the work permit book is strictly personal and are valid only on the premises granted in the permit, normally in one location only.

If a foreigner resigns, his work permit must be cancelled and a new applied for.

If a work permit holder changes his occupation or the type of work in the company, it must be approved again by the Labour Department.