I think there could be some overlap in the steps, (start scanning before they have all arrived) could potentially shorten things up, but this is a good picture.
So I agree with vhab49 - some overlapping to shorten the wait time is possible.
Like I started and finished, this was never meant to be more than a sanity check for scoping
As with any engineering project, the devil is in the details. There are some unknown unknowns on our end that prevents us on this board from knowing true durations of even the planned activities.So let's take a quick look at those things, using round numbers.
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You can argue with my assumptions for durations, but the turnaround time of slightly over a month passes the sniff test.
Plus we all know that and Murphy works on every project. If you haven't learned this lesson yet, you have no business taking the PPE. I truly suspect that the "long pole" is the having to schedule impromptu exam review meetings. I gave that 5 days in my estimate but in the past it has delayed the release by several weeks.