Merzo,
Anything I do without an actual dimensioned drawing is a caricature. I measure photos for dimensions, but I do not do the detailed calculations for optical compensation. This one was drawn by eye with the final scale checked from this picture - if the aeroshell is 4.5m across the bottom then the descent stage is about 1.25m across the central hexagon from the front to back face.
So, about 1:20 scale. An 80% adjustment (printer or drawing) puts it at 1:24 where you could do a 50% print of the MSL Curiosity Rover and get a pretty good match ...
Yogi