Re-building doors,window felts,scrapers,window regulators..Question

[djmachinist]

I'm going to attempt to re-line the windows and rebuild the window regulators and replace the vent windows. My question what would be the best quite insulation to use while have the doors apart? I assume you install the material against the outside door skin. It does not look like there is much room to accomplish this judging by the size of the dooe access panel. I have seen "Hushmat" and "Hushmat board" mentioned on this Board. Any thoughts?

Thanks,
Dale