UPDATE -. I was having trouble with the slots -I am a beginner with illustrator and thought that I was creating the files wrong BUT, I figured out what I was doing wrong - lol. I forgot to ‘zero’ out my calipers when measuring the material that I was using. once I fixed that my pieces are now fitting perfectly! Thanks to all of you who offered help
Where can I find a tutorial to design my own slotted standing Christmas tree file and other standing items with illustrator.