I’m building an outdoor bbq and have just finished the frame. I am looking for advice on the best material to clad the interior and exterior. The BBQ is going to sit in the large space at the back so am going to clad that in Villaboard but should I also use that for the sides, back and inside? I’m going to have cupboards so am worried if I use cement sheet for the lining it might crack when drilling holes for shelves