Experimenting on existing model

Modelling on one and experimenting on the other

I kept going back to my previous model to experiment first in case if I made a mistake or error I can easily undo to a certain point. Once I am satisfied with end result I then duplicate it and put it with the original model. I find this less risky and more convienient method as you can see what you can do on an object and apply it to another if the desire meets the expectations.