Great pictures! Stunning snake. Most people go with 4' x 2'.
I too recently ordered a few setups from Animal Plastics, but I'm yet to set them up or fill them (Repticon, end of august! here I come!) So I can't comment yet on Humidity ect. They receive good reviews, but until I do it myself, I can't really comment.
All the best, and thanks for the pictures, just gorgeous.