I have been doing ceramics for over 20 years with a few years off here and there but I have never heard of using slipcast pieces from different molds together And altering the pieces!! What a great bunch of ideas. I would like to point out that the way he poured the mold out by just tipping it completely upside down is NOT the right way to dump slip!!! By doing it the way he did you have a great chance of the piece caving in on itself!! Always lie it on its side and then turn upside down.