Here's about what everything cost...

500 for the driver
300 for the amp - 500 watt Parts Express plate amp that's in it's own little box
and I think about 100$ or so for wood, little speaker spikes...

and the other costs could include things like air compressor and brad nailer, table saw.. huge clamps, etc...

but if you've got all the tools it's doable in a weekend...

I still haven't really "finished" it yet.. it's just raw MDF but it weighs so much I'd rather wait until the wife's pressure is enough to make me move it I think if I do move it I'll put casters on the back so I can just lift the front and wheel it around...