How good do you want the finished edges. ? Surely it's better to make a template out of 6 mm mdf and finish with a top bearing router bit. I would think any jigsaw will struggle to maintain accuracy in 18 mm ply ?
For the job I am doing a good finish is not important
Nearly all the curved cuts will be on 12mm ply , Most of the cuts on the 18mm will be straight using my Festool track saw
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