Davo, I personally use a scroll saw, makes cutting plywood easy and can do complex shapes rather well if you're patient with it. Mine is a el cheapo GMC that cost me around AUD$90 if memory serves me correct and it has been going hard for the past 4 years.................great investment, oh yeah, I have been known to also cut aluminium with it from time to time also (just chews the blades).
Johno
Western Australia