Sounds reasonable.

To everyone trying this out, please be careful. If you get error messages, be extra careful and rethink what you did. If in doubt, abort the whole procedure. There are instructions on how to remove scratchbox, too (cant find the link), and that's sometimes useful if you want to start over.

To me, those instructions are more of a checklist, but that's because I went through the sb installation procedure several times now, and I still manage to make stupid mistakes.