There is a company called BACO who do aluminium sheeting in various textured finished, such as five bar plating (standard chequer plate), diagonal checked, fluted sheet or embossed orange peel type effect and it comes in different thicknesses for different designs.
Some start at 0.5 mm, 1.2 mm or 2 mm thick and go up to about 6 mm which would be way too thick anyway!!
Where abouts are you from? Ill let you know your local branch however they may only sell trade which is how we buy...
Jaime