What is the largest size possible (that can be shipped without an ordeal)?

Lynn Boggess, paints on large canvases (some over 4 ft x 4 ft) using cement trowels:

http://www.lynnboggess.com/

Obviously, that is probably unrealistic for shipping from China.

Also, I was interested in having some abstract paintings "copied", using some of the images from:

https://open_nsfw.gitlab.io/

The images are only 224pxx224px.

Would that be possible? The image resolution is not that big, but I would like something like 2 or 3 feet in length/width.