Playsuit pattern alterations

Hi all,

I am hoping for a bit of help from all you wonderful people. I have this great playsuit pattern which is all separate pieces but I want to make it a one piece with the shirt and shorts joined together. Any ideas on the best way to do this. The pattern has the shorts joining at the side with a zip. Would it be best to do a long zip down the side into the shirt as well?

I'm never very good adjusting patterns! Thought maybe someone out there has done something similar and had some tips!

thanks,

Arnika