hello TS, want to ask u something..

it been my dream to built house using a container.. i dont have problem with the exterior since i can clad it with timber... what i want to know is.. how to get smooth finish on the interior so that it felt like a cement wall..and also i dont want it to feel hollowed and feel like there`s a cavity inside it..

what`s ur oppinion TS? if i want to achieve a house like this https://www.youtube.com/watch?v=5riy3rs8J4U in malaysia, which way is cheaper? container or common brickwork..?