8 ft wardrobe shutter thickness

You mentioned to use blockboard for cupboard more than 7ft. What should be the board thickness for 8ft sliding wardrobe and 8ft openable wardrobe.

It really depends on the construction on the shutter. For framed construction the frame thickness usually is 18 mm and the inside panels approx 6 mm. For regular shutters it will be 19 to 24mm. The thing to note is that sliding door shutters need to be constructed as light as possible without compromising their resistance to warp