Just borrow tools, buy some cheap MDF boards from bunnings and just make a simple squarish/retanglular shaped box. Then goto an uphostery place and buy some carpet and get urself some rubber glue =) bushstyles bombage. Bunnings would also be able to cut the boards for you for cheap maybe even free. Can also goto an audiohouse or somethin like that and pick up some plastic ports. you can get one's that you can just push into the wood but try find some you can screw into the wood over some gaskets to re-inforce them. between the boards you can even go cheapo and reinforce them with some thick double sided tape so you wont ever get rattles after a homejob on the box. Or even fold the carpeting over so you can use that to reinforce.

*shrugs*