Here below is a link where you can view some of my 1/48 Real space build ,that I done over the years , some are scratch, some are modified , you also can view some of my ongoing project :
Interesting displays, very professional looking presentations.
They are probably larger that the photographs appear, something like a coin beside the models would add a sense of size and scale for the viewer. Maybe a coin from the year each was in service? I am sure Russian coins can be sourced as well from the time of Sputnik.