Bolt Action - Air Filter Trees

We are getting ready for a local convention (AK Battle Brothers) here in Alaska.  The convention organizer, Thomas, has been busy making terrain and boards for the event.  He came up with a very creative way to make homemade trees using furnace filters.  I thought that since most of you BARbarians like to DIY, I'd share Thomas' tutorial with the community.

So what do you think?  Pretty neat idea huh?  I sure like it.  Do you have any DIY ideas for making terrain, make sure you share with the rest of us on the forum.