I got the Madbull assembly guide. I'll take some pictures of the guide and upload them for you. It's like 4 pages, not that hard. Just put the gearbox in the gun, put rear body pin in, motor grip, buffer tube, then any bits like mag catch, Forward Assist, charging handle, etc.
EDIT: Actually instead of crappy photos how about a pdf guide?
http://www.madbullairsoft.com/doc/Ma...20Manual-2.pdf