User blog comment:Xenodrone98/Lego Seamoth is DONE!!!/@comment-30446184-20161107160154/@comment-30446184-20161107162006

Fair enough, although I'd recommend that you join. Probably the easiest way to contact the devs.

And on the topic of custom stickers, I've looked into it a bit myself. Here's some advice on the topic from Brickset:

http://bricksetforum.com/discussion/comment/295426#Comment_295426