I don't think so. Then again, I was never very picky about my design. I'd just make sure the base is in line with the general body type you want, otherwise I can't really see any problems with doing that.
There's some pretty good bases out there for those of us who are bad at drawing. If you have a program that can support Photoshop files (like fire alpaca) I would recommend looking into rad panda's free reference sheet. I'm working with it now and it's very nice.