If all goes according to plan, we'll have a total of 4 costumes: Shredder, Krang's android body, Bebop and Rocksteady.
breakdown of all the costume parts we need
Bebop and Rocksteady are definitely the most complicated of the four, at least when it comes to the number of pieces we'll have to put together.
We've got lots of work to do but I think we've made pretty good progress so far. This weekend I worked on the masks and finished Rocksteady's helmet and goggles.
cheap safety goggles, foam core & bottle caps
finished army helmet from a bike helmet