Hello everybody,
what has always been lacking is the analysis of the right support structure of the RSS, including the Hinge Column to the FSS, with whom I have engaged myself in some detail. And as I have already suggested, this looks similar to those on the left with regard to undersized profiles. 
This involves first of all the parts 22, 39, 41, 47 and 54 shown in Revell’s assembly guide.
And now I have noticed that the lower side parts of the front elevation below the RSS Main Floor are open to the fore, and not closed as in the Revell-RSS. 
That looks here for the STS-6 at least so, as if these two platforms are open towards the front. 
Source: retrospaceimages.com (STS-6)
Therefore this one must be taken under a closer look. 
