Who are you talking about The Saturdays? Please use quotes.
Everything would be constructive, and whether it is fixable or not, is not really the important part, that can be addressed after.
Ideally we would spend lots of time just driving that one particular model, noticing any flaws with the model itself. if there is anything odd, we can screen shot it, blow it up, and reference it to where it is on the model, so that the modeler can see what we are referring to. Some modelers don't have the time to play the model enough to notice every little thing, plus not all modelers have the expertise of seeing many of these cars up close.
I cant speak for the rest of the people on this forum that have volunteered, but a majority of these cars I have seen, or can see at any time.