I've done very large rewrites from scratch successfully and I've done very large rewrites incrementally successfully. I think it can happen just fine. Of cour

I've done very large rewrites from scratch successfully and I've done very large rewrites incrementally successfully. I think it can happen just fine. Of course, doing that as a one-man team with a closed-source commercial product that you have promised to give away for free doesn't seem like the kind of thing that can get done.