Shift-Return merely opened the PICT resource with the same View by PICT setting. However, it doesn't crash immediately when I first open it, which gave me a chance to click the View menu and choose "by Name" -- that avoids the crash.You can prevent ResEdit from trying to display thumbnails of the list of PICT resources (and therefore maybe crashing if there’s junk in there) by opening the “PICT” resource type icon while holding down the Shift key, or by typing Shift-Return. This gives the list at left, you can see “plus”, “classic”, etc. which I presume ought to be the PICTs for each bare logic board.
I also don't see an "Open Template..." command. However, in the Resource menu in ResEdit, there is a similar one named "Open Using Template..." That presents me with a dialog box with PICT selected by default. If I merely OK that, it then shows me text data like Size, Rect & Opcodes (which is what your first screenshot shows). When I try to close that dialog, it gives me an "Invalid rectangle" dialog and asks "Save it anyway?" If I click No, it merely shows me the Size/Rect/Opcodes dialog again and won't close it.
The problem with taking CMD-Shift-3 screenshots to get those pictures is that I can only get Snooper 2 to display the logic board pic tied to the given Mac I am using. So when I load Snooper 2 on my SE/30, it shows me that logic board pic, and I don't see any option to switch it to another Mac. So maybe someone out there has every supported Mac in his collection, and he could then run Snooper on each of them to take all those individual screenshots, but that is quite a lot of work and would take some time to do.
With that said, I sincerely appreciate your interest in solving this mysterious problem, Crutch!