http://tanasinn.info/wiki/Cherimoya_GNU/Linux
Namely, creating a branch of it that uses Openbox.
Just fetch the Openbox sources and compile (then move to your $PATH or whatever). You might even be able to grab the binaries from Arch Linux's repository if they use the same package manager.
Honestly I wish Tanasinn.info wouldn't associate itself with this project. Then again it's a wiki and it's just one guy editing it, so whatever.
...almost three years later.
i still don't see why someone would use this instead of just installing those package on arch.
it looks like this distro died in 2011, before >>1 even posted about it.