These are the spaceships of Star Trek I've been collecting and editing for print, 1:4489.5 scale are:
-Enterprise: Measures 143mm long, this model has brackets
-D'Kir (Vulcan): measures 182mm long, add the supports via software.
-D'Deridex (Romulan): measures 232mm long, this model does not need the brackets. Pictured is a smaller scale.