Karen, the Birds Australia web site has plans and dimensions for nest boxes.
http://www.birdsaustralia.com.au/infosheets/05_nestboxes.pdf
Powerful Owl is not on the list but maybe the Barn Owl box dimensions would 
suffice?
Cheers, Alex.
> Date: Tue, 12 Feb 2008 12:10:31 +1100> From: > To: 
> > Subject: [Birding-Aus] powerful owl nest box 
> plans> > Hi all,> > I am a teacher at Yea High School. We have a large 
> project with the year> 7's & 8's involving them in conservation. This year we 
> are looking at the> bird species in the area. The students plant trees, look 
> at hollow and old> paddock tree preservation as well as the birds themselves. 
> Part of the> project is involving the construction of nest boxes. Last year 
> they made> bat boxes this year we are going to construct bird boxes. I'm not 
> sure> what are the best boxes for the best birds for this area. Though 
> powerful> owls might be a goer. Anyone have any suggestions.> > Cheers,> 
> Karen> > > -- > K. Collard> Year 10 Manager> > 
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