I don't want everything sitting in the same repository. This might just be paranoia, but since I'm using a DVCS (Mercurial), I don't want everyone who downloads

I don't want everything sitting in the same repository. This might just be paranoia, but since I'm using a DVCS (Mercurial), I don't want everyone who downloads the project to have to download the source code + design documents + anything else. The design, especially, is mostly made up of binary files, which don't play too well with source control since they're not diffable. Also, I really only have 2 subfolders - a design folder which is kept under SVN (so that I don't worry about the really large files), and a main folder kept under Mercurial. All other folders are just clones of the main folder for when I want to mess around with different ideas, and these have to be different repos anyway. Is that clearer?