So, if you want to draw the structure of several related species, it is better to first create a skeleton file for this group than to use a general skeleton (e.g. that from E. coli for all drawings. You can do this by making a structure drawing for one representative of the group using a general skeleton file (or even without a skeleton).
From this drawing you can create a new skeleton, which will be better fit for the group, and use this to create drawings for all the other drawings in the group.