You can follow the procedures above and do this with 3.7 just as easily. If you run into
any bumps you will see that you can just find the spot in the code that has aproblem and make the change so it is looking for your vb3_ or master table instead of the slave sites table.
I did this on
www.mmowned.com and
www.fpsowned.com with fpsowned.com being the slave site. It all works very well.