Han, perhaps it's just a matter of interpretation? Take this page from the manuscript that is obviously a step by step UFO assembly diagram instructing users on how to tend to your very own bio-morphological-flying ship:
I believe there is at least one other image that contains a treatise on engine management and dissection that is a companion page to this one. I love how we are seeing layered cross sections of this spheroidal ship, which, once assembled in the manner prescribed above, you can see how it would resemble that classic sphereoidal saucer shape as seen throughout the 50's and beyond.
There's a very striking resemblance in fact to the Jupiter2, whose design was completed by a little known Hollywood art director, who after completing the ship design fir the series disappeared, and his name? You guessed it, Voynich!