Modify a vector (.cdr or .ai) image

Attached is a vector image (in both formats - .cdr and .ai) of rib cage looking tribal artwork. I'd like to expand it a bit by adding a few more 'bones' at the bottom (or top, whatever you prefer). You just need to add more 'bones' to the artwork. Create 3 duplicates, one with two additional bones, second with 3 and fourth with four additional bones. Thats it! Thank you for your time.