2yrs ago, we're able to buy a furnished 20" van as my mobile office at the plant for around 200k

-me hardiflex wall/ceiling
- switch for 2 florescent
- 2x2 windows
- toilet with lavatory
- provision for window type ac
- breaker

Painted na eto. All you have to do is install your ac, tap electricity and water supply (+ septic tank).
Not sure if the price is inclusive of delivery.