Me and my sister regularly take in papercraft orders [right now our orders chart is so full we've delayed use of our business page on facebook XD]. My sister did this one mostly on her own.
Go to papercraftmuseum.com
Search "super mario" or "boo"
Once you find the Super Mario Boo that you want to make, click and print out
Dotted lines: fold
Straight lines: cut
..Hope you enjoy making this papercraft! :3