I use the copier method. I copy my original plan and put it away. I use this for building on. I have a third copy made for cutting up for patterns. Just make sure your copies are an exact copy of the original plan. I don't like the tracing method. Your lines can be off and it just takes too much time. How well does using an iron work on photocopy transfering? I will have to try it.

I tried using Krylon removable adhesive spray on the patterns and also put it on both sides of news paper placed between each layer of wood stacked for multiple cutting. It sure works nice but you go throught a lot of spray glue.
I'm going to try a couple of dabs of CA to tack the stack together to cut it. This should work ok just as long as the glue drops are small so you can seperate them easily.

ZZ