If you want to use plywood you're going to have a hard time cutting it to size without at least a jigsaw (which can be purchased fairly cheap, but cut quality is proportional to price). Some big-box hardware stores will cut panels for you, however, so that would be an option if you have one of those nearby.
edit: oh yeah, hoppy's post reminded me of the skilsaw, so a jigsaw isn't your only option.
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The coolest fish I've owned: Silver Arowana, Silver and Gold Datnoids, Archer Fish, Anableps, Mudskipper, African Leaf Fish, True Leaf Fish, Moth Catfish, Chaca Chaca, Apistogramma agasizzi.
Last edited by Alpinist; 12-08-2009 at 10:39 PM.