As you may have noticed I do a few hard patterns. To hold the pieces of 1/8th plywood together (never less that four) I drill holes in the larger waste areas, the last to be cut. In those holes I glue toothpicks, Yep, toothpicks. Drill the holes the size of the toothpicks. dab a touch of glue on the toothpick, sand off the amount sticking out and YOLA, the pieces all stick together and will not move a bit. Use to use brads till I found out about this. Ever hit a nail with a scrollsaw blade.