:D:D:D It is a bonus point for you, that you built the Vorīcha cruiser! Now you know how to use the flaps
Okay here a the dimensions of the real Excelsior (Reference: Gilso fleet chart):
Length: 467m
Width: 186m
Heigth: 78m
Please measure the diameter of the saucer (bottom side) and you have the scale
(and donīt forget the edge coloring :D )