Closeups, looks like real paint(brush) job. Would be h*ll of a job!
https://s27.postimg.cc/ni63f7gqb/Immagine_008.jpg
https://s27.postimg.cc/epp4rivlf/Immagine_014.jpg
Could be mistaken, yet think they did the brown first then the green... pffff....
Marcel
PS More pictures here: https://piti.forumfree.it/?t=70396519