Nice to see someone acknowledge the superiority of plywood! It has been my go to for a number of years now - and also underlayment which is just a thinner sort of plywood. Like the way you did the tops of your trees. And delighted you didn't go the route of the giant 'buzz saw truncated' trees that others have done. While I understand their reasoning, the visual impact for me just flat out doesn't work. Yours, however, work grand.