Easy enough to build something like this, but if you had to go out and order all the parts these days it will be quite expensive for such a huge transformer. The reservoir and smoothing capacitors for such an application are getting quite pricey these days as well.
The most cost-effective is probably to pick up a suitable old surplus power unit. The U.K. branch of eBay has all sorts of stuff like this in the Ham radio area.
You might have a more limited choice for Australia/New Zealand though, and on something this heavy I hate to think how much it would cost to get shipped from England.
