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[Fuscus]

Cheat. You can buy 4 1200 x 450 x 14 malamite from the Green shed for $12 each (make sure that they are exactly the same length). And there is a thin sheet with a white plastic coating that you can buy for $18 (suitable for 2 enclosures). Get the backing sheet cut to size at the shop. If you live in QLD or any tropics use pegboard instead. Take home.
On a flat smooth surface, glue and screw the malamite together to form a cube. Don't screw to close to the edge (thats an opening for the fishboy). Pay attention to the edges. The malamite has an uncovered edge, this edge should be face up as we want to place the backing on it and you can't move your cube until the backing is attached. Glue and nail the backing onto the cube. Use the backing to ensure that your cube is square and use 15-20 mm Flat head nails.
So far you need a hammer and a cordless screwdriver (hint - If you are into woodwork get two cordless screwdrivers). Use heaps of glue and wipe of any excess with a wet rag.
Now you have a box with an open front end and it has enough structure to be moved. Stand it up or flip it over.
You require a top and bottom brace, recommend you use Tassie Oak (really blue gum). Select straight bits, look along the edge to judge how straight a piece of wood is Cut carefully so that they fit snugly. Stain and seal before attaching to box. On each brace attach your runners for the glass.
Use a hole saw attachment to drill four holes in each side to fit the small circular plastic vent covers which you glue in place. Vents are a week spot so I suggest you put a cover on each side of the hole.
You now have a basic cage which just need the electrics, something to climb on and your new friend (you know, the one with its teeth in your arm). I recommend that you also build a kick board to lift the cage off the ground. This is also a big cage, you could put dividers and make it int two, three or even four cages.