There don’t seem to be many DIY animatronic web sites around but there are a few pretty active Facebook sites. All of them are private, to help keep down the spam, so you have to request access. These groups are well worth it to find DIY animatronic info:
DIY Animatronics Group – https://www.facebook.com/groups/891805981203854/
Animatronic Builders – https://www.facebook.com/groups/747161395755561/
DIY Halloween Animatronics – https://www.facebook.com/groups/DIYHalloweenAnimatronics/
THE ANIMATRONIC FORUM – https://www.facebook.com/groups/215520962797038/