I wouldn't get hung up on the cloning part. If your goal is to create a simpler version of a project management suite, then do that. Find out what features yo

I wouldn't get hung up on the cloning part. If your goal is to create a simpler version of a project management suite, then do that. Find out what features you want in it and build it. If it turns out cheaper than basecamp with fewer features, or more expensive with more features, then market it accordingly.