The restoration pavilion is right next door to the museum's main building. You can walk the length of the boat outside on the sidewalk, looking right in through the glass.
Check with the museum in advance to see when the tours inside the restoration building are offered (it can be sporadic, depending on what work is going on in there).
A few years ago, my wife and I were back there visiting family and went down to the museum. I stood outside, sipping coffee, watching the workers tearing down one of the Packard engines. My wife observed that if we still lived there, I'd be down there volunteering every weekend. She was right.