Quite east really. Make a box frame out if whatever you like. Metal or wood. When boarding it imaging you let a total wastercut the boards for you. Don't have the edges nice and neat. Plenty of scrim on every joint. Slap on a thick bonding coat nice and heavy. As it's drying out use brush stroked to create the wood grain. Then add whatever detail you like. Once dry it's just about trial and error. I used different wood stains to make it look aged.I’d love to know the process. Looks so real!