I can make the as big as 48 inches by 96 inches or as small as you can see with the naked eye. Lasers are great, I do 3d images on stone I first laser etch the image then cover with a rubber mat, cut the rubber sandmast then sand blast so the image is 3d. Here is a picture of a fireplace I am working on and you can see the stages. I tried to offer my services in the beginning of joining the forum as a vendor but no takers. If I had some interest I would pay for a vendor spot again. I also have a waterjet and cnc router mill.
The GT40 on plywood is 21 inches by 40 inches.