From your documents. Visa and work permit will expire soon, please renew your license for convenient registration of car in the next year. However, the current can be used normally.
The balance to be paid. Show details In the attached file.
For insurance. There is only one company (Khumpai) that can identify and limit insurance coverage. The remaining two companies also need to be confirmed (LMG and Viriyah). The results will be known within two days. if anything change will be inform you as soon as possible.