To stack cut I use 1/8"bb, first I cut the wood to size, then I sand the face of each piece. Then I use spring clamps to hold the layers together, next I work my way around the perimeter with a glue gun. The nice thing about using a glue gun, is that the glue can be removed easily. After gluing things together, I apply the pattern using spray glue. Then I drill all of the holes for blade insertion, after that, I sand the back piece to remove any whiskers. Lastly, I proceed on to the cutting of the pattern. How you remove the pattern is up to you, you must be used to doing that part. Especially if, your attempting to stack cut portraits.
Len