Greetings!

It is right on the borderline. What you might want to do is just open the Mark2A, disconnect the drives that are in it, and hook the new 80GB drive up. Do the build there, and then reapply 2.0 and hijack on the 2A. Disconnect the new drive, reconnect your existing ones. This will leave your Mark2A with the newly loaded 2.0 and hijack, but with all of your old configuration and music data. It will also give you a pre-built disk that you can drop in the Mark2... Note - you will need to install 2.0 and hijack on that Mark2 as well.