After painting with leftover white paint and utilizing more scrap wood, and then purchasing some lockable castors from Bunnings which were on special, I ended up with this. I'm not completely happy with it. It looks more like a painter's scaffold than a bench seat. Still, it is sturdy - used the brackets removed from the garage shelving from here. I'll need to mull over it more to see what else I can do with more scraps to make it more presentable - maybe add a back to it. Right now I'm seeing 'industrial' but not 'chic'... not yet anyway.