Every inch and ounce counts

I am waiting for my Haulmark 6x12 vnose to arrive and I am trying to figure out all the schematics..I would like to stay as light and simple as possible..The 6x12 with 6ft height is going to be just enough room for my purposes..I am going to put vinyl flooring for easy clean up..I am going to insulate the sidewalls and then put the factory luan back on..maybe ill stain or paint the wall...Not too sure which route to go with the ceiling..I def want to insulate it but not sure what to cover it with..I know most go with luan but is there anything lighter or thinner..The 6ft ceiling is going to be just enough height and want to save every mm that I can of vertical space....any other tips or tricks for staying light