so if i put mighty putty on the outer surface of my plastic part, let dry, cut my design out from the inside. When i cut out my design I won't cut it all the way through, there will be a channel left behind to holster the resin in place. After that im going to let it set over a few days and grind the mighty putty off, sand it, dilute acetone it and texture it.
I think it will work for sure.